Video: Lindsay Lohan jumps on stage to sing Britney Spears' "Womanizer" with Lily Allen. Lily doesn't seem to like the idea!

Lily Allen performed at the Wiltern in Los Angeles last night and while she sang a cover of Britney's "Womanizer," career-kryptonite Lindsay Lohan burst onstage hoping to join the British pop star in a duet. Lily, however, wasn't so keen on the idea.