Katie Price and Peter Andre share never-before-seen photos of son Junior to mark his 16th birthday

Katie Price and Peter Andre took to Instagram on Sunday to dedicate sweet messages to their firstborn son Junior on his 16th birthday.

Both Katie, 43, and Peter, 48, shared a collage of never-before-seen photos of their eldest child on social media, with Katie calling him her ‘absolute world’.

Doting father Peter also made sure to gush about Junior, telling him: ‘I’m proud to be your dad.’

Family: Katie Prince, 43, and Peter Andre, 48, took to Instagram on Sunday to dedicate sweet messages to their firstborn son Junior on his 16th birthday

Sweet 16: To mark the milestone, doting father Peter shared a photo of his son standing in front of an enormous 16 sign

Sweet 16: To mark the milestone, doting father Peter shared a photo of his son standing in front of an enormous 16 sign 

The amicable exes – who wed in 2005 before splitting in 2009 – both posted photos of Junior through the years, sharing snaps of him as a newborn right up to his teenage years.

Katie wrote in full: ‘Junior. My absolute world! From the moment Junior was born he’s been by my side, and now he has grown into a gorgeous little man and the world is his oyster.’

Peter penned: ’16 years of pure Joy having you in my life. I love who you have become. Kind, funny, talented but most of all loving and respectful.

‘Happy birthday my son. I’m proud to be your dad. Love you’

'My world': Katie shared a collage of never-before-seen photos of her eldest child on social media, calling him her 'absolute world'

Throwback: Katie even shared a photo of herself just after giving birth to Junior

‘My world’: Katie shared a collage of never-before-seen photos of her eldest child on social media, calling him her ‘absolute world’

Through the years: The amicable exes - who wed in 2005 before splitting in 2009 - both posted photos of Junior through the years

Through the years: The amicable exes – who wed in 2005 before splitting in 2009 – both posted photos of Junior through the years

Katie wrote: 'From the moment Junior was born he's been by my side'

Katie wrote: ‘From the moment Junior was born he’s been by my side’

Way back when: Doting mother Katie also shared a throwback photo of herself, Junior and her daughter Princess, 13, cuddled up

Way back when: Doting mother Katie also shared a throwback photo of herself, Junior and her daughter Princess, 13, cuddled up 

Katie concluded her post: 'Now he has grown into a gorgeous little man and the world is his oyster'

Katie concluded her post: ‘Now he has grown into a gorgeous little man and the world is his oyster’

It seems that Junior will spend the day at his father’s with the Mysterious Girl hit-maker later taking to Instagram to share a video of his sunny back garden as he told the camera: ‘Junior’s birthday today, got lots planned.’

Katie and Peter met on I’m A Celebrity… Get Me Out Of Here! in 2004 and were married the following year.

They appeared on reality TV together, released singles as a duo and hosted a chat show in their years as a married couple, before going their separate ways.

Peter penned: '16 years of pure Joy having you in my life. I love who you have become. Kind, funny, talented but most of all loving and respectful'

Peter penned: ’16 years of pure Joy having you in my life. I love who you have become. Kind, funny, talented but most of all loving and respectful’

He concluded his post: 'Happy birthday my son. I'm proud to be your dad. Love you'

He concluded his post: ‘Happy birthday my son. I’m proud to be your dad. Love you’

Big day: It seems that Junior will spend the day at his father's with the Mysterious Girl hit-maker sharing a video of his back garden, saying: 'Junior's birthday today, got lots planned'

Big day: It seems that Junior will spend the day at his father’s with the Mysterious Girl hit-maker sharing a video of his back garden, saying: ‘Junior’s birthday today, got lots planned’

They also share daughter Princess, 13, while Katie shares Bunny, six, and Jett, seven, with former spouse Kieran, 33.

Peter and his doctor wife Emily, 31, share children Amelia, seven, and Theo, four, while Katie is currently engaged to Carl Woods.

Junior’s younger sister Princess also dedicated a sweet social media post to her older brother.

The teenager also shared a montage of snaps, writing: ‘Junior! I cannot believe you are 16. Your an amazing brother to me and you have grown up so much! I love you so much happy birthday.’ [sic]

Sister: Junior's younger sister Princess also dedicated a sweet social media post to her older brother

Sister: Junior’s younger sister Princess also dedicated a sweet social media post to her older brother

Princess wrote: 'Junior! I cannot believe you are 16. Your an amazing brother to me and you have grown up so much!'

Princess wrote: ‘Junior! I cannot believe you are 16. Your an amazing brother to me and you have grown up so much!’