Lohan Cleans Up Act, Gets Back to Acting

Lindsay Lohan popped out of rehab and got back to work last night, filming scenes for her movie, "I Know Who Killed Me."

A radiantly healthy-looking LiLo is playing a woman who develops a dual personality after enduring a brutal kidnapping. She is seen here on a night shoot for the thriller.

Lindsay had an appendectomy on January 4, and entered Wonderland rehab on January 17.