"Jason and Chrishell have been secretly dating for a few months now," an insider told E! News. "They have always had a connection while working together."
The outlet also reported that on July 4, the Selling Sunset costars were spotted together in Las Vegas, where they attended the ResortsWorld grand opening and had dinner at FUHU with costars Brett Oppenheim, Mary Fitzgerald and Romain Bonnett.
"The whole group was having a lot fun enjoying their night out, eating, laughing and having drinks together while checking out the new property," the source shared.
After dinner, the group then reportedly moved to the Ayu Dayclub, where Miley Cyrus was throwing an event. The real estate broker, 44, and 40-year-old are said to have held hands as they made their way through the crowd.
"Jason and Chrishell were really cute watching Miley," the source gushed. "Jason often put his arms around Chrishell as they sang along to Miley's songs together."
As previously reported by OK!, the two jetted off the Capri, Italy, with costars Brett, Fitzgerald, Bonnet and Amanza Smith. The former Dancing With the Stars contestant debuted their romance by sharing snaps of the pair getting affectionate on Instagram.
"Love you Chrishell. Thank you for making my brother happy," Brett commented.
"Nothing makes me more excited than to see two of my closest friends together and making each other so happy! 😍❤️," Fitzgerald gushed.
"Awwwww!!!! Congratulations you guys!! Finally IG official ❤️❤️❤️," Louise wrote.
"Chrishell and I became close friends and it has developed into an amazing relationship. I care about her deeply and we are very happy together," Oppenheim told E! News. A representative for Stause told PEOPLE that they were "happily together."
Stause and ex-husband Justin Hartley called it quits in 2019, but the divorce was reportedly finalized earlier this year. She was also previously linked to Keo Motsepe.