Just weeks after “Grey’s Anatomy” returned with new episodes, sources are saying Katherine Heigl is itching to hang up her scrubs. “She’s working really long hours and is ready to move on,” a source close to the actress told Us Weekly.

Fifteen months ago, Heigl renegotiated her “Grey’s” contract. The net result from that: Because the negotiations went public and she got the raise she wanted from the show, Heigl proved she wasn’t about to become an of-the-moment primetime star. Additionally, Heigl has had tremendous big-screen success with her leading roles in “Knocked Up” and “27 Dresses.”

“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,” said a movie industry source.

Even so, Heigl might be locked into “Grey’s” a bit longer. “I don’t think she’ll be able to get out of it,” the US source said of Heigl’s contract.

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