Chace Crawford ‘dating co-star’

Chace Crawford is reportedly dating his Blood and Oil co-star Rebecca Rittenhouse.

The former Gossip Girl actor turned 30 years old on July 18 and he celebrated the milestone birthday a week later with a bash held at the London Hotel in West Hollywood, California on July 25.

Apparently he and his castmate were inseparable at the event.

“Rebecca was by Chace's side most of the night,” one insider told Us Weekly magazine.

But despite getting cosy at his party, it’s claimed the rumoured couple aren’t eager to make a strong commitment to each other yet.

The lovebirds are said to be more interested in feeling each other out at the moment.

“He and Rebecca have been hanging out, [it’s] nothing serious,” another source noted. “They had great chemistry on set and he really enjoys hanging out with her. I wouldn’t call them official, but there is a romance between them for sure."

Chace’s bash was star-studded, as attendees included his Gossip Girl co-stars Ed Westwick and Jessica Szohr, as well as his sister Candace Romo, Zelda Williams, JC Chasez, and Caroline Wozniacki.

It’s claimed everyone had a great time at the swanky affair which was sponsored by Freixenet Spanish Cava and River Virtual Reality.

"It was a very dressed up night and people were really laying into him,” a partygoer detailed. “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. It was a big blowout.”

Chace and his model partner Rachelle Goulding split in July 2014. After their breakup he was briefly romantically linked to The Hills star Audrina Patridge.