Katherine Heigl to quit Grey's?

Katherine Heigl is considering leaving hit US TV show 'Grey's Anatomy' to concentrate on her film career, it has been claimed. The 29-year-old actress - who has found success in romantic comedies 'Knocked Up' and '27 Dresses' - is said to be keen to end her contract with the medical drama to focus entirely on movies.

A source close to the actress said: "She's working really long hours and is ready to move on. She's a smart one. "She saw what can happen with someone like Jennifer Aniston, who was crazy successful on TV, but can't seem to carry a film, and she tested the waters early."

However, Katherine - who made headlines when negotiations for her contract renewal on the show were made public 15 months ago - may be locked into her contract and will have to continue starring as Dr. Isobel Stevens.

The source added to Us Weekly magazine: "I don't think she'll be able to get out of it." Katherine can next be seen in romantic comedy 'The Ugly Truth' with Gerard Butler.