Looks like we have some on and off-screen chemistry brewing!

As Chace Crawford gears up for the series premiere of his new series Blood & Oil, speculation is brewing that things may be turning romantic between him and a certain co-star.

Over the Labor Day weekend, the Gossip Girl alum was spotted celebrating the holiday with Rebecca Rittenhouse.

In an Instagram video posted by Scott Michael Foster, both Chace and Rebecca appear to be getting cozy as they enjoy a boat ride along the Jordanelle Reservoir.

"On the water with @chacecrawford @jordyofantastico @rebeccarittenhouse and @zoe_levin," Scott wrote on Instagram. Chase added, "Back to Thkool. @rebeccarittenhouse @zoe_levin @jordyofantastico."

Scott Michael Foster, Rebecca Rittenhouse, Instagram

Instagram

While it may seem like a friendly outing amongst co-stars, a source recently spotted Chace and Rebecca away from any cameras as they enjoyed an evening at Boneyard Saloon and Kitchen in Park City, Utah.

During a break from filming in the city, the twosome arrived together where they couldn't help but show some PDA.

"They were kissing a lot and very cuddly," our source shared with us. "At one point, Chace was very sweet and kissed her on the forehead. As they were leaving, he put his arm around her."

Chace Crawford, Rebecca Rittenhouse, Instagram

Instagram

Both parties have yet to comment on the possible romance rumors.

For now, the entire cast is gearing up for the premiere of their new show that features Chace and Rebecca playing a newly married couple that moves to "The Bakken" in North Dakota where the largest oil discovery has been made.

Chace's character later goes head-to-head with a ruthless oil tycoon played by Don Johnson. Episodes begin airing Sept. 27 only on ABC.

—Reporting by Taylor Banks 

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