"Chrishell and I became close friends and it has developed into an amazing relationship," Jason said. "I care about her deeply and we are very happy together."
Speculation about the pair began on Wednesday, when Chrishell, 40, took to Instagram to share pics from her recent trip to Italy with her Selling Sunset co-stars, and showed PDA with Jason in some of the snaps.
In the first shot, a bikini-clad Chrishell stands with her arm around a shirtless Jason, 44, as they pose with Mary Fitzgerald, Romain Bonnet, Brett Oppenheim and Tina Louise.
Other photos in the post included more group shots, but the final two pics were heavy on the PDA between the co-workers. In one pic, Chrishell kisses Jason's head while they sit on a boat, while the final snap shows him laying a smooch on her neck.
In March, Chrishell said in an Instagram comment that she was "off of men." When ET spoke with Chrishell in May, she said she was "really focused" on her career, rather than dating.
"Obviously, I have not figured that part out," she said of dating. "... I'm just keeping an open mind. I'm not blocking anything out, but we'll see. I have no idea."
As for what kind of guy she'd eventually want to date, Chrishell joked, "Right now, the bar is, is he nice, is he honest, does he recycle? Truly, this is why I'm going to focus on my career for a while."