Katherine Schwarzenegger is seen stepping out for a round of tennis with her sister Christina

Katherine Schwarzenegger and her younger sister Christina were seen heading to a tennis court in Brentwood, California on Monday.

Both skipped tennis skirts in favor of warmer leggings as the temperature in the Los Angeles area has dipped below 60 degrees F.

This comes after their father, former California governor Arnold Schwarzenegger, slammed President Donald Trump in a long video shared to Instagram. 

Time for two: On Monday, Katherine Schwarzenegger was spotted getting ready for a game of tennis with her younger sister Christina

The 31-year-old was spotted dressed in a black sweater on top of a pair of matching athletic leggings; she further developed her dual-tone clothing ensemble with a white t-shirt and a pair of running shoes in the same color.

The author kept her gorgeous brunette hair tied back for her outing and wore a pair of pointed sunglasses to keep the shining sun rays out of her eyes.

She accessorized with a number of gold necklaces and bracelets with a pair of earrings during her game.

Her sister wore a light blue zip-up hoodie with a matching pair of athletic trainers; she also could be seen in a set of leggings that were not dissimilar from Katherine’s.

Dual tone: The author opted for an two-color clothing ensemble for her game as she wore a black sweater and matching leggings along with a white t-shirt that was paired with a set of athletic shoes of the same color

Dual tone: The author opted for an two-color clothing ensemble for her game as she wore a black sweater and matching leggings along with a white t-shirt that was paired with a set of athletic shoes of the same color

Staying safe: The new mother was seen wearing a black face mask in order to keep herself and her loved ones protected from any chance of exposure to COVID-19

Staying safe: The new mother was seen wearing a black face mask in order to keep herself and her loved ones protected from any chance of exposure to COVID-19

Her blonde hair was also tied back in a ponytail that she kept underneath a black baseball cap; Christina wore a pair of sunglasses for the outing as well. 

Both sisters kept themselves protected from any potential exposure to COVID-19 by wearing large face masks during their shared time outside.

The older Schwarzenegger sister has been taking the past few months to recover from the birth of her first daughter, Lyla Maria with her husband Chris Pratt.

The couple first began dating in June of 2018 and were married a year afterwards; Lyla is the author’s first daughter with her husband.

Pratt also shares a son named Jack, aged eight with his first wife Anna Faris; the two were married in 2009 and eventually separated from each other eight years later before finalizing their divorce in 2018.

New parents: In August, Schwarzenegger welcomed her first child with her husband Chris Pratt; they named their daughter Lyla Maria

New parents: In August, Schwarzenegger welcomed her first child with her husband Chris Pratt; they named their daughter Lyla Maria

Over the weekend Arnold Schwarzenegger has branded Donald Trump the ‘worst president in history’.

The former Governor of California hit out at the US leader following the Capitol riots – which were sparked by the Commander-in-Chief’s repeated claims of election fraud – last week but warned the former ‘Apprentice’ star will quickly be deemed ‘irrelevant’ once he leaves office.

He said: ‘President Trump sought to overturn the results of an election and of a fair election. He sought a coup by misleading people with lies…

Beach day: The new parents shared a set of photos on New Year's Eve depicting their baby daughter's first trip to the beach

Beach day: The new parents shared a set of photos on New Year’s Eve depicting their baby daughter’s first trip to the beach

‘I know where such lies lead. President Trump is a failed leader. He will go down in history as the worst president ever. The good thing is he will soon be as irrelevant as an old tweet.’

The ‘Terminator’ star then went on to criticise the individuals who have ‘enabled [Trump’s] lies and his treachery.’

He continued in a video message: ‘John F. Kennedy wrote a book called Profiles in Courage. A number of members of my own party, because of their own spinelessness, would never see their names in such a book. I guarantee you/

‘They’re complicit with those who carried the flag of self-righteous insurrection into the Capitol.’

The 73-year-old actor also reflected on the history of his home country, Austria, which ‘suffered the loss of its democracy’ in the 1930s and drew comparisons with the US today.

Dad is not a fan: This comes after their father, former California governor Arnold Schwarzenegger, slammed President Donald Trump in a long video shared to Instagram

Dad is not a fan: This comes after their father, former California governor Arnold Schwarzenegger, slammed President Donald Trump in a long video shared to Instagram

He said: ‘I grew up in Austria. I’m very aware of Kristallnacht, or the Night of Broken Glass. It was a night of rampage against the Jews in carried out in 1938 by the Nazi equivalent of the Proud Boys.

‘Wednesday was the Day of Broken Glass right here in the United States.

‘The broken glass was in the windows of the United States Capitol. But the mob did not just shatter the windows of the Capitol. They shattered the ideas we took for granted.

Before the incident: U.S. President Donald Trump speaks to his supporters at the Save America Rally on the Ellipse on Wednesday, January  6, 2021 near the White House in Washington, D.C. before his followers stormed the Capitol resulted in five deaths

Before the incident: U.S. President Donald Trump speaks to his supporters at the Save America Rally on the Ellipse on Wednesday, January  6, 2021 near the White House in Washington, D.C. before his followers stormed the Capitol resulted in five deaths

‘They did not just break down the doors of the building that housed American democracy. They trampled the very principles on which our country was founded.’

The ‘Twins’ actor was born two years after World War II ended and recalled how he saw ‘broken men drinking away the guilt over their participation in the most evil regime in history.’

He explained the movement had ‘started with lies, and lies, and lies, and intolerance’ and warned America could face ‘dire consequences’.

He said: ‘So being from Europe, I’ve seen firsthand how things can spin out of control. I know there is a fear in this country and all over the world that something like this could happen right here.

‘Now, I do not believe it is, but I do believe we must be aware of the dire consequences of selfishness and cynicism.’