London, March 10 (IANS) Pop diva Madonna and Scottish star Gerard Butler had a dance-off at a post-Oscars party hosted by actress Demi Moore.

The 'Material Girl' singer helped host the bash at manager Guy Oseary's Los Angeles home following the prestigious ceremony Sunday night and couldn't resist when the actor challenged her dancing skills, reports holly-wood.net.

'Madonna and Gerard were grinding on the dance floor before getting into a dance-off. It was hilarious,' said a source.

Apart from Butler, Madonna also showcased her dance moves with actress Gabourey Sidibe.

'Madonna danced non-stop for four hours. She and Gabourey were dancing together at one point. They had a great time. This was the Oscar party to be at this year,' said the source.

The do was attended by a host of stars, including Moore's funnyman husband Ashton Kutcher, P. Diddy, Renee Zellweger, Bradley Cooper and Taylor Lautner.