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Uh-oh! Sam better watch out.

Lindsay Lohan is back to work on Robert Rodriguez's Machete - yes, she seriously got the role! - and tweeted to Cash Warren: "i'm on set with your beautiful wifey." Not that there's anything wrong with that (hey, Alba is a beauty!) but still... we wonder what Sam thinks about this considering their relationship is so on and off!

LiLo, who plays a girl named April, also tweets that the "shoot is going great!" Wonder if she and fellow blonde Jessica will have any sexy scenes together?