Move Over, Jen! Brad Pitt Flirting With 21-Year-Old After Crashing Aniston's Birthday

Just days after Brad Pitt shockingly showed up to ex-wife Jennifer Aniston's birthday bash, a source revealed to RadarOnline.com exclusively he's crushing on his 21-year-old co-star Sydney Sweeney!

Pitt, 55, is besotted by Once Upon a Time In Hollywood co-star Sweeney — and insiders reckon it’s a strong possibility they’ll start dating. “She’s absolutely made an impression on him during their time together on the movie and he’s been sweet on her ever since."

The A-list actor had to sign off on Sweeney's casting because of her multiple scenes with him. Now, sources say, he and Quentin Tarantino both think they’ve got the next Marilyn Monroe in Sydney, "but it’s a lot more than her talent that’s gotten him hooked."

"She really wowed them both, especially Brad who wants to do more projects with her and spend time off set to get to know her."

"They’ve spoken a few times since the movie wrapped on Nov. 1, 2018 and it’s been intensely friendly between them," spilled the snitch. "Nobody would be surprised if he asked her out on a date, even though there is that huge age difference.”

The news comes just two days after Jennifer Aniston’s 50th birthday party on Saturday night which featured a shocker of a guest—her ex-hubby Pitt!

The actor helped Jen celebrate her big milestone along with other A list guests at the Sunset Tower Hotel, years after he’d famously left her for Angelina Jolie.

Pitt, now locked in a bitter divorce from Jolie, 43, looked delighted to be marking Aniston’s night of partying which also featured such pals as George Clooney, with wife Amal, Reese Witherspoon, Ellen DeGeneres, Demi Moore, Barbra Streisand, and Kate Hudson. Another ex of Pitt’s, his former fiancé Gwyneth Paltrow, also made the scene.

Aniston and Pitt were Hollywood’s golden couple until their divorce in 2005 — after he’d cheated on her with Jolie. The scandal shocked the world.

Pitt went on to build a family of six kids with Jolie and they finally tied the knot in 2014. They split two years later. Aniston wound up marrying actor Justin Theroux after a long engagement, but announced her split from him in February 2018.

We pay for juicy info! Do you have a story for RadarOnline.com? Email us at tips@radaronline.com, or call us at 800-344-9598 any time, day or night.