BRAD PITT helped Jennifer Aniston celebrate her 50th birthday.

Pitt was spotted at the actress’ birthday party at the Sunset Tower Hotel in Los Angeles on Saturday, PEOPLE confirms.

Pitt, 55, made a casual entrance at the hotel, where his ex-wife, who turns 50 on Monday, held her big bash. The actor arrived at the hotspot with his long hair slicked back underneath a cap.

A source tells PEOPLE party guests included Pitt’s ex Gwyneth Paltrow, plus Aniston’s ex John Mayer and his ex Katy Perry, who was joined by boyfriend Orlando Bloom.

George and Amal Clooney, Reese Witherspoon, Robert Downey Jr., Ellen DeGeneres, Barbra Streisand, Keith Richards, Kate Hudson, Laura Dern, Demi Moore and Jennifer Meyer were among the familiar faces at the star-studded fête.

Aniston also celebrated with her “Friends” costars and good pals Lisa Kudrow and Courteney Cox, whose ex-husband David Arquette attended.

Following the news of Aniston and ex-husband Justin Theroux’s split in February 2018, a source with knowledge of Pitt and Aniston’s relationship told PEOPLE the stars — who were married from 2000 to 2005 — had “been over each other for longer than they were ever together.”

While Aniston and Pitt had remained friendly over the years, the source said the two weren’t especially close.

(SD-Agencies)