Russell Brand been secretly seeing Playboy bunny and former girlfriend of Hugh Hefner Holly Madison, according to reports.

The comedian and film star is believed to have met the Playboy star earlier this month at a party in Las Vegas hosted by rapper Jay-Z.

They have continued the friendship ever since during regular meetings in Los Angeles, where Russell is shooting new film Get Him To The Greek.

“Russell has really hit it off with Holly. She’s a big star in the US, which he finds really attractive,” a source told The Sun newspaper.

“And his constant tomfoolery has her in stitches. Russ has been making late-night visits to her home in the Hollywood Hills.

“He’s been there three times in the past week and neighbours have heard them ‘enjoying themselves’ loudly.”

Holly separated from Hugh, Playboy's founder, last year. She appeared in the most recent series of the US TV show Dancing with the Stars.

Get Him To The Greek is the sequel to Russell's acting debut Forgetting Sarah Marshall.