The pop star's newest music video, G.U.Y. - An ARTPOP Film, debuted Saturday night, with several RHOBH stars in supporting roles.
Lisa Vanderpump, Yolanda Foster, Carlton Gebbia, Kyle Richards and Kim Richards all appear, dressed in pink, and gently strum musical instruments while Gaga, as a large bird that's been shot through and through with an arrow, is revived in a huge swimming pool!
The seven minute vide -- nearly 12 minutes when you include the credits -- was shot at California's famed Hearst Castle, a national historic landmark maintained as a state park.
It was the first video ever shot at Hearst Castle and Gaga won praise for donating $250,000 to the castle's preservation foundation on top of paying all the costs of castle staff working overtime.
But the involvement of the Housewives was top secret -- until last night.
Vanderpump got extra screen time with Gaga, in a scene where she carries her dog, Giggy, on a power walk though a building with the singer.
"This may be the most fun thing I've ever done," tweeted Kyle.
Even Bravo's got a cameo, as Zeus!
But Brandi Glanville She was nowhere to be seen! What must she be thinking about the shut out? Maybe Gaga's not a fan?