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Chace Crawford Dating Blood and Oil Costar Rebecca Rittenhouse — See Photos and Get All the Details From His B-Day

Rebecca Rittenhouse and Chace Crawford
Chace Crawford is dating Rebecca Rittenhouse!

New couple alert! Chace Crawford rang in his 30th birthday with a special lady by his side — Rebecca Rittenhouse. The Gossip Girl alum, who was feted by brother-in-law Tony Romo and manager Eric Podwall with a 30th birthday roast on Saturday, July 25, is dating his Blood and Oil costar, multiple sources confirm to Us Weekly.

Related: PHOTOS: Chace's sexy shirtless bod

“Rebecca was by Chace's side most of the night,” one insider tells Us of the birthday boy, whose dinner and party, presented by Freixenet Spanish Cava and River Virtual Reality, was held at the London Hotel in West Hollywood, Calif.

“He and Rebecca have been hanging out,” another source confirms to Us, adding that although it’s “nothing serious,” “they had great chemistry on set and he really enjoys hanging out with her.”

Related: PHOTOS: Chace and Ed's bromance

“I wouldn’t call them official,” the insider maintains, "but there is a romance between them for sure." 

With his new love interest by his side, Crawford was also celebrated by pals including Gossip Girl costars and exes Ed Westwick and Jessica Szohr, as well as sister Candace Romo, Zelda Williams, JC Chasez, and Caroline Wozniacki, among others.

"It was a very dressed up night and people were really laying into him,” a partygoer tells Us of the roast. “Tony Romo had the best jokes of the night, he and Chace are very close and have a great bond…Everybody had fun partying afterward as well,” the source adds of the bash. “It was a big blowout.”

Related: PHOTOS: Celebrity couples

Exes Westwick and Szohr also had a blast. "Ed's totally cool with Jessica," the insider adds. "She is serious with Scotty [McKnight] now and Scotty is part of the crew."

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