Lindsay Lohan Guest Stars on 'Anger Management'

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Looks like Lindsay Lohan is back in the acting saddle again!

The starlet, as reported by TMZ, pulled off her guest appearance on Anger Management Monday during filming.

Lindsay's first scene featured her in bed with Charlie Sheen ... according to the script they had just had sex. We're told, "Lindsay knew her lines cold and her timing was perfect. She was really funny."

Lohan -- who showed up 45 minutes EARLY -- was "incredibly nice" and spent a fair amount of time taking pictures with the crew.

One source says Lindsay, who plays herself, "proved she has talent. You watch her and you know why she became a star."

Wow, could this really be a new LiLo?! And it took Charlie Sheen of all people to change her?