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Guess Me From Behind

KYLE ROVER/startraksphoto.com

Here's a wardrobe tip for last night's cheeky dresser: If it's cold enough for a fur vest, you should probably be wearing pants!

But not even attending Vanity Fair's famous Oscar afterparty with her daughter could convince this entertainer to cover up.

Can you guess who threw caution (and clothing!) to the wind with this leotard, lace and fishnet combo—baring her well-toned butt cheeks as she made her way into the bash?

Lordes Leon, Madonna

Kevin Mazur/VF11/WireImage

 

 

 

 

 

 

 

 

 

It's Madonna! The Material One and her daughter Lourdes attended the annual Oscar party at the Sunset Tower Hotel together.

Mom wore...well, not very much, while leggy Lola modeled an All Saints Aztec dress and a sheepish grin.

And Melissa Rivers thought her mother was embarrassing!

Tune in tonight to see if Joan Rivers behaves herself as she and the Fashion Police panel review Oscar's red carpet action with their verdict for best and worst dressed.

WATCH: The 2011 Academy Awards: Fashion Police special tonight on E! at 10!