Lindsay Lohan is an "absolute genius", Charlie Sheen has revealed.
The troubled 26-year-old actress is set to star on the FX comedy Anger Management, where she will play herself as a patient who falls for the charms of Charlie's character, Dr Charlie Goodson.
"We all fell in love with this little girl that was just an absolute genius and had this great light about her, and that's still there. You can't extinguish that," he told Entertainment Tonight.
In the episode, Lindsay's character will end up in bed with Dr Goodson after flirting up a storm. It would be the second time they are filmed between the sheets together, following their union in the upcoming Scary Movie 5.
"There's a moment where there's a lot of gratitude that you're actually doing that and getting paid," Charlie joked.
Lindsay - who will feature on Late Show With David Letterman on April 9, her first appearance on the programme in six years - is currently facing 90 days in rehab as part of a plea deal in a misdemeanour car crash case in California.