Cyrus and Madonna party down post-Oscars

Miley Cyrus danced with Madonna at her post-Oscars party.

The 'Open Your Heart' singer threw her annual huge bash following the awards on Sunday night at her manager, Guy Oseary's, house in Los Angeles where she took to the floor with '4x4' singer Miley.

A source said: "Miley was dancing with Madonna, and Julia [Roberts] was dancing with her friend."

Miley, 21, and Madonna, 55, previously collaborated when they performed a mash-up of 'Don't Tell Me' and 'We Can't Stop' for the younger singer's recent MTV 'Unplugged' special.

Julia is presumed to have been dancing with her date for the night, a high school friend, as her husband, Danny Moder, had to work and couldn't attend.

Meanwhile, other A-list stars flooding the party included Brad Pitt, Angelina Jolie, Lupita Nyong'o, and newly engaged Mila Kunis and Ashton Kutcher.

The source added: "Brad and Angie were talking to Julia and hanging out with Lupita, who was walking around with her Oscar telling everyone it was the best night ever."

Meanwhile another new couple, Charlize Theron and Sean Penn, made a very public display of their affection.

The source added: "Sean and Charlize were making out on the dance floor."

Also in attendance during the night were Leonardo DiCaprio and his model girlfriend Toni Garrn, Jennifer Lawrence, her 'American Hustle' co-star Bradley Cooper and his girlfriend Suki Waterhouse as well as Oscars host Ellen DeGeneres and her wife, Portia De Rossi.

Thanks for watching and tweeting! Now I need to meet with my friend, Margarita. See you tomorrow for my live show! #Oscars

— Ellen DeGeneres (@EllenDeGeneres) March 3, 2014

Earlier, as she finished hosting the awards, Ellen wrote on Twitter: "Thanks for watching and tweeting! Now I need to meet with my friend, Margarita."