Actress Mary-Kate Olsen is to make a guest appearance on Christina Applegate's comedy series Samantha Who?

The star plays a "self-destructive bad girl" in her cameo, but her professionalism on set has been highly praised by the TV show's executive producer Don Todd.

He tells People.com, "She showed up alone, ready to work, is great on set and is serious about the job. This is a girl who's been in front of the camera almost literally her entire life. She's smart, and she knows what she's doing."

-Check out Mary-Kate Olsen's Filmography

(This news article provided by World Entertainment News Network)