Leonardo DiCaprio and Rihanna got "super steamy" as they partied together at the Playboy Mansion on Saturday night.

According to TMZ, a couple of eyewitnesses saw the pair share a sneaky smooch but a friend of Leonardo's has told the gossip website that was not the case.

The pair partied alongside several other stars including Paris Hilton, Tom Hardy, Naomi Campbell, Pamela Anderson, Hilary Duff and Tobey Maguire.

The 40-year-old actor is said to have been invited to the bash by Nikki's producer boyfriend Chuck Pacheco, and while it is not known whether or not he left with the 26-year-old stunner they are thought to have ended up at the same after-party along with rapper 50 Cent.

Leonardo looked to be having a good time at the after-party as he jokingly photobombed a picture of Naomi and the 39-year-old star, who uploaded the image on his Instagram account.

Last month, it was reported Leonardo had "officially split" from his girlfriend Toni, 22, after dating on and off for two years.