Lady Gaga: Acting Debut in 'Machete Kills'

In a cinematic universe where Charlie Sheen can be the president of the United States and Lindsay Lohan can play a gun-toting nun, it should be no surprise that writer-director Robert Rodgriguez would tap Lady Gaga for his zany "Machete" series. Still, the news Mama Monster filmed her feature film debut on the set of Machete Kill s was apparently Hollywood's best-kept secret.

Given Rodriguez' do-it-yourself take on the movie business, he broke the news himself Thursday via Twitter, posting, "I just finished working with @LadyGaga on @MacheteKills, she kicked SO MUCH ASS! Holy Smokes. Blown away!"

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Rodriguez also posted a character poster reading, "Lady Gaga as La Chameleon." While nothing's known of the role, it seems the star's penchant for changing her image plays heavily into it - perhaps a deadly mistress of disguise?

Gaga is pictured topless, but covered by a dead wolf she's draped around her, a golden pistol with a smoking silencer in her right hand. She's wearing a glamorous blonde Marilyn Monroe-style wig and matching yellow bottoms with thigh-high stockings.

The star posted on her Twitter feed in response, "Yes its true, I will be making my debut as an actress ln the amazing MACHETE KILLS… IM SO EXCITED!!! AH! Filming was insane."

In "Machete Kills," Sheen's president taps the series titular hero, played by Danny Trejo, to stop a space-based terror weapon. The movie also stars Mel Gibson, Sofia Vergara, and returning actresses Michelle Rodriguez and Jessica Alba. It opens in 2013.