Jennifer Aniston All Smiles At TV Show Set After 'Hugging, Chatting With' Brad Pitt

Jennifer Aniston had to film scenes for her upcoming TV show with Reese Witherspoon on Monday despite turning 50 years old on Feb. 11. Despite this, the "Friends" actress still had a huge smile on her face after celebrating with her pals over the weekend.

Aniston was all smiles at the Los Angeles set of her Apple-produced TV series on Monday morning. In photos released by Daily Mail, the actress wore a dark long-sleeve sweater, black pants, white sneakers and a long camel scarf when she arrived on the set. She accessorized with sunglasses and kept her locks loose.

This latest sighting comes just two days after she held a lavish birthday bash at the Sunset Tower Hotel in LA with many of her celebrity friends. Among her guests was Reese Witherspoon, who will co-star with her in their upcoming TV show.

However, Witherspoon may have had a little too much to drink during Aniston's 50th birthday bash as she was photographed falling down the stairs and looking wasted after leaving the party.

Aside from the Witherspoon, Aniston's star-studded 50th birthday party was also attended by Gwyneth Paltrow, Aniston’s ex John Mayer and the musician’s ex Katy Perry, People reported. The latter was joined by her boyfriend, Orlando Bloom.

Aniston also invited George and Amal Clooney, Robert Downey Jr., Ellen DeGeneres, Barbra Streisand, Keith Richards, Kate Hudson, Laura Dern, Demi Moore and Jennifer Meyer to celebrate the big milestone with her.

Aside from Mayer, another ex of Aniston's also made a surprise appearance at her party: Brad Pitt. The actress' ex-husband was spotted arriving at the hotel with his long hair slicked back under a cap.

Pitt reportedly attended the bash to show his support for his ex-wife, whom he married in 2000 and divorced in 2005. The two had reportedly remained friendly in the years following their divorce.

"Jen and Brad have remained friends and have spoken with each other quite a few times since they both became single," a source told Entertainment Tonight. "They are friends and have supported each other through some tough times. They've come so far since their marriage and plan to stay friends for life. There are truly no hard feelings between them."