The actor, who turned 59 on Sunday, celebrated his birthday with girlfriend de Ramon, 32, in Hollywood, California.
The two were seen getting out of a car, with Pitt dressed casually in a gray button-up, matching slacks and white shoes.
Meanwhile, the jewelry executive wore a tan coat with a furry white lining, her hair hanging in front of her shoulders in loose waves.
They were first photographed together on Nov. 13 alongside Cindy Crawford and Rande Gerber backstage at a Bono concert at Los Angeles’ Orpheum Theatre.
According to a source at the time, the Academy Award winner “is really into” de Ramon, who separated from her husband, Vampire Diaries star Paul Wesley, earlier this year.
De Ramon accompanied Pitt at an afterparty for his new movie Babylon on Thursday.
