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Preemptive strike! Katherine Schwarzenegger works off the cake as she hits the gym before her birthday bash

Published: 22:18 EST, 13 December 2014 | Updated: 22:22 EST, 13 December 2014

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She celebrated her 25th birthday on Saturday.

And perhaps Katherine Schwarzenegger was preparing for all the goodies she was about to consume as she hit the gym in Brentwood, Los Angeles on Friday.

The daughter of Arnold Schwarzenegger and Maria Shriver highlighted her pert posterior in dark grey leggings paired with a pale blue hoodie.

Getting a workout: Katherine Schwarzenegger hit the gym in Brentwood, Los Angeles on Friday

A make-up free Katherine sported neon pink sneakers and carried a chic purse, with her hair swept up in a high bun.

She appeared to be chatting with a friend in the distance, bursting into laughter.

The next day, Katherine celebrated her 25th birthday – the same day that Taylor Swift rang in hers.

She Instagrammed a photo with several of her friends, writing, ‘Great way to close the chapter of 24! Hi 25 let's do this!’

Ready to gorge on cake? She was perhaps preparing for all the goodies she was about to consume on Saturday for her 25th birthday

Gym chic: The daughter of Arnold Schwarzenegger and Maria Shriver highlighted her pert posterior in dark grey leggings paired with a pale blue hoodie

Katherine shared another image with a friend of hers, writing, ‘Happy birthday to my bestie and the most beautiful blonde bombshell @jess_kuuuh !

‘We've shared our Bday for 25 years and I couldn't be happier to call you my twin and my bestie! Love you!’

Mom Maria Shriver, 59, made several gushing tributes to her oldest daughter, tweeting a photo of them together, with the caption: ‘She made me a mother for the 1st time 25 years ago.

Fancy footwear: A make-up free Katherine sported neon pink sneakers and carried a chic purse, with her hair swept up in a high bun

Festive! On Saturday, Katherine Instagrammed a photo with several of her friends, writing, 'Great way to close the chapter of 24! Hi 25 let's do this!'

BFF: The brunette beauty shared another image with a friend of hers, writing, 'Happy birthday to my bestie and the most beautiful blonde bombshell @jess_kuuuh !'

‘Happy Birthday @KSchwarzenegger! I love you to the moon and back’

The TV correspondent added with another photo: ‘Look at this beautful (sic) young woman-25 years ago @KSchwarzenegger was born. Lucky world lucky me & anyone who meets her’

She also shared a flashback photo of Katherine as a young girl, writing: ‘It goes sooo fast. Happy 25 Birthday @KSchwarzenegger please bring this look back’

Mommy and me! Mom Maria Shriver, 59, made several gushing tributes to her oldest daughter, tweeting a photo of them together, with the caption, 'She made me a mother for the 1st time 25 years ago...'

Adorable: The mother-of-four also shared a flashback photo of Katherine as a young girl, writing, 'It goes sooo fast. Happy 25 Birthday @KSchwarzenegger please bring this look back'

Finally, Maria tweeted an image of Katherine smiling broadly while holding her cake and balloons, with the caption: ‘25 25 25!! Celebrating this gorgeous young woman @KSchwarzenegger’

Younger brother Patrick, 21, shared a photo of him and big sis, writing: ‘Happy birthday to the best sista evaaaaa. Love you@katherineschwarzenegger’

Katherine also has younger siblings Christina, 23, and Christopher, 17.

Birthday girl: Finally, Maria tweeted an image of Katherine smiling broadly while holding her cake and balloons, with the caption, '25 25 25!! Celebrating this gorgeous young woman @KSchwarzenegger'

Sibling love: Younger brother Patrick, 21, shared a photo of him and big sis, writing, 'Happy birthday to the best sista evaaaaa. Love you@katherineschwarzenegger'