Billie Eilish and Foo Fighters perform onstage in Burbank for iHeartRadio ALTer EGO livestream

Five-time Grammy winner Billie Eilish and 11-time Grammy winners Foo Fighters graced the Burbank stage of the fourth annual iHeartRadio ALTer EGO, which streamed on Thursday.

The 19-year-old whispery soprano performed Therefore I Am alongside her 23-year-old brother and collaborator Finneas for the concert presented by Capital One.

Eilish (born O’Connell) covered her curvaceous 5ft3in form beneath her signature baggy, androgynous athleisure attire and Nike sneakers selected by stylist Samantha Burkhart.  

11-time Grammy winners Foo Fighters graced the Burbank stage of the fourth annual iHeartRadio ALTer EGO, which streamed on Thursday

Two generations: Five-time Grammy winner Billie Eilish (L) and 11-time Grammy winners Foo Fighters (R) graced the Burbank stage of the fourth annual iHeartRadio ALTer EGO, which streamed on Thursday

‘To be quite honest with you, I only started wearing baggy clothes because of my body,’ Billie said in her March cover story for Vanity Fair.

‘The reason I used to cut myself was because of my body.’

The Lo Vas a Olvidar hitmaker was not thrilled about the reaction she got from wearing a clingy tank top and shorts in Los Angeles on October 11.

‘I thought that I would be the only one dealing with my hatred for my body,’ Eilish said of the images going viral. 

Siblings: The 19-year-old whispery soprano performed Therefore I Am alongside her 23-year-old brother and collaborator Finneas (R) for the concert presented by Capital One

Siblings: The 19-year-old whispery soprano performed Therefore I Am alongside her 23-year-old brother and collaborator Finneas (R) for the concert presented by Capital One

Athleisure: Eilish (born O'Connell) covered her curvaceous 5ft3in form beneath her signature baggy, androgynous attire and Nike sneakers

She relies on stylist Samantha Burkhart

Athleisure: Eilish (born O’Connell) covered her curvaceous 5ft3in form beneath her signature baggy, androgynous attire and Nike sneakers selected by stylist Samantha Burkhart

Billie said in her March cover story for Vanity Fair: 'To be quite honest with you, I only started wearing baggy clothes because of my body'

Billie said in her March cover story for Vanity Fair: ‘To be quite honest with you, I only started wearing baggy clothes because of my body’

The Lo Vas a Olvidar hitmaker added: 'The reason I used to cut myself was because of my body'

Like most teenagers, Billie has struggled with self-confidence

The Lo Vas a Olvidar hitmaker added: ‘The reason I used to cut myself was because of my body’

‘But I guess the Internet also hates my body. So that’s great.’

Hairstylist Joseph Chase coiffed Billie’s neon-and-black mullet for the virtual show.

Make-up artist Tammy Yi made sure the homeschooled vegan was ready for her close-up, and she rocked a silver chrome manicure by acrylic nail artist Tammy Taylor.

Backstage, Eilish put her hair partly up and changed into a red T-shirt, joggers, and Nike Air Jordans.

'I guess the Internet also hates my body': Eilish was not thrilled about the reaction she got from wearing a clingy tank top and shorts in Los Angeles on October 11

‘I guess the Internet also hates my body’: Eilish was not thrilled about the reaction she got from wearing a clingy tank top and shorts in Los Angeles on October 11

Hairstylist Joseph Chase coiffed Billie's neon-and-black mullet for the virtual show

She was bathed in red light at one point during the show

Red light special: Hairstylist Joseph Chase coiffed Billie’s neon-and-black mullet for the virtual show

Smile: Make-up artist Tammy Yi made sure the homeschooled vegan was ready for her close-up, and she rocked a silver chrome manicure by acrylic nail artist Tammy Taylor

Smile: Make-up artist Tammy Yi made sure the homeschooled vegan was ready for her close-up, and she rocked a silver chrome manicure by acrylic nail artist Tammy Taylor

Strike a pose: Backstage, Eilish put her hair partly up and changed into a red T-shirt, joggers, and Nike Air Jordans

She's trying to adjust to performing without an audience due to COVID-19

Strike a pose: Backstage, Eilish put her hair partly up and changed into a red T-shirt, joggers, and Nike Air Jordans

Billie told The Woody Show: 'This is the first time I haven't had an audience's energy to bring the best out of me. I had to like bring it out of myself. It's weird'

Billie told The Woody Show: ‘This is the first time I haven’t had an audience’s energy to bring the best out of me. I had to like bring it out of myself. It’s weird’

‘The energy you get in a room of like 40K kids is really like nothing else in the world. I can’t even describe it,’ Billie told The Woody Show.

‘It’s been great to be able to do a couple virtual shows, livestreams, or whatever. I did this big livestream show like a month ago, which was really fun and it was live so I felt like a connection.

‘But it was crazy though at the rehearsals. This is the first time I haven’t had an audience’s energy to bring the best out of me. I had to like bring it out of myself. It’s weird.’

The Joe Biden supporter will next star in a documentary film titled The World’s a Little Blurry, which will be released in theaters and start streaming on Apple TV+ on February 26.  

Eight-figure paycheck! The Joe Biden supporter will next star in a documentary film titled The World's a Little Blurry, which will be released in theaters and start streaming on Apple TV+ on February 26

Eight-figure paycheck! The Joe Biden supporter will next star in a documentary film titled The World’s a Little Blurry, which will be released in theaters and start streaming on Apple TV+ on February 26

Who will win? Eilish will then compete four trophies - including record of the year - at the 63rd Annual Grammy Awards, which air March 14 on CBS

Who will win? Eilish will then compete four trophies – including record of the year – at the 63rd Annual Grammy Awards, which air March 14 on CBS

Eilish was ‘paid eight figures’ through Interscope Records for her first-ever rock-doc directed by RJ Cutler, who also helmed the 2009 Vogue documentary The September Issue.

Billie will then compete four trophies – including record of the year – at the 63rd Annual Grammy Awards, which air March 14 on CBS.

Meanwhile, the Foo Fighters performed their 1997 hit Everlong as well as new tracks like No Son of Mine and Waiting on a War.

It’s hard to believe former Nirvana drummer Dave Grohl founded his Seattle rock band 25 years ago.  

Headbanging: Meanwhile, the Foo Fighters performed their 1997 hit Everlong

They also played new tracks like No Son of Mine and Waiting on a War

Headbanging: Meanwhile, the Foo Fighters performed their 1997 hit Everlong as well as new tracks like No Son of Mine and Waiting on a War

After Kurt Cobain's suicide: It's hard to believe former Nirvana drummer Dave Grohl (M) founded his Seattle rock band 25 years ago

After Kurt Cobain’s suicide: It’s hard to believe former Nirvana drummer Dave Grohl (M) founded his Seattle rock band 25 years ago

The 52-year-old frontman (2-L) joked backstage: 'We walk up onstage and look like f***ing Gandalf from Lord of the Rings. I'm proud of that, seriously, I'm totally into this aging process'

The 52-year-old frontman (2-L) joked backstage: ‘We walk up onstage and look like f***ing Gandalf from Lord of the Rings. I’m proud of that, seriously, I’m totally into this aging process’

Yasss! Old or not, Foo Fighters just scored their ninth No. 1 hit with their new track Shame Shame, which topped the Billboard Mainstream Rocks Songs airplay chart on December 19

Yasss! Old or not, Foo Fighters just scored their ninth No. 1 hit with their new track Shame Shame, which topped the Billboard Mainstream Rocks Songs airplay chart on December 19

In sync: Dave was joined onstage by his keyboard player since 2017, Rami Jaffee (L), as well as his drummer since 1997, Taylor Hawkins (R)

In sync: Dave was joined onstage by his keyboard player since 2017, Rami Jaffee (L), as well as his drummer since 1997, Taylor Hawkins (R)

‘We walk up onstage and look like f***ing Gandalf from Lord of the Rings,’ the 52-year-old frontman joked backstage.

‘I’m proud of that, seriously, I’m totally into this aging process.’

Old or not, Foo Fighters just scored their ninth No. 1 hit with their new track Shame Shame, which topped the Billboard Mainstream Rocks Songs airplay chart on December 19.

Dave was joined onstage by his keyboard player since 2017, Rami Jaffee, as well as his drummer since 1997, Taylor Hawkins. 

Rami (2-L) said backstage: 'It's so good now that we're finally playing together again!'

Rami (2-L) said backstage: ‘It’s so good now that we’re finally playing together again!’

He hasn't aged! Grohl's guitarist since 1995, the Germs alum Pat Smear (2-R), served guitar duties as usual

He hasn’t aged! Grohl’s guitarist since 1995, the Germs alum Pat Smear (2-R), served guitar duties as usual

They completed it a year ago: After coronavirus-related delays, the band is finally dropping their 10th studio album Medicine at Midnight on February 5

They completed it a year ago: After coronavirus-related delays, the band is finally dropping their 10th studio album Medicine at Midnight on February 5

Dave told The Woody Show: 'You know what 2020 was, it was a whole lot of phone calls that went like this - "Can we put the record out yet?" No. "Can we put the record out yet?" No. "Can we please put the record out yet?" Mmmm, okay'

Dave told The Woody Show: ‘You know what 2020 was, it was a whole lot of phone calls that went like this – “Can we put the record out yet?” No. “Can we put the record out yet?” No. “Can we please put the record out yet?” Mmmm, okay’

Grohl explained: 'It was supposed to come out in July or something, but we make these songs for people to hear them and sing along and get down to and I thought, well now is a better time than ever'

Grohl explained: ‘It was supposed to come out in July or something, but we make these songs for people to hear them and sing along and get down to and I thought, well now is a better time than ever’

Rami said backstage: ‘It’s so good now that we’re finally playing together again!’

Grohl’s guitarist since 1995, the Germs alum Pat Smear, served guitar duties as usual.

After coronavirus-related delays, the band is finally dropping their 10th studio album Medicine at Midnight on February 5.

‘The one thing we didn’t do [in 2020] was write any music. You know what 2020 was, it was a whole lot of phone calls that went like this – “Can we put the record out yet?” No. “Can we put the record out yet?” No. “Can we please put the record out yet?” Mmmm, okay,’ Dave told The Woody Show.

‘I think we all got to the point where we felt like, “Okay we made this record. It was supposed to come out in July or something, but we make these songs for people to hear them and sing along and get down to and I thought, well now is a better time than ever because everyone has a lot of time to get down to at home. A lot of that year was planning for 2021.’