They are two of the world’s biggest pop stars who just both happen to have shared snaps of themselves frolicking about in their swimwear online.
So it would be rude if Lady Gaga and Rihanna didn’t have have a bikini-off!
Gaga was enjoying some rare time-off from her world tour in South America as she hit the beach.
Meanwhile, Ri Ri was celebrating completing her new album ‘Unapologetic’.
As she soaked up the sunshine in a golden bikini, she tweeted: “We havin a celebration…. WE HAVE AN ALBUM!!!”