A Piece of the "Rock" for Josh?

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Could silver-screen hunkster Josh Hartnett be making the move to the small screen? The 29-year-old Black Dahlia star is rumored to be thinking about proving his comedic prowess on NBC's hit sitcom 30 Rock.

On March 8, the former beau of Scarlett Johansson was spotted exiting the NBC building in NYC's Rockefeller Center after taking part in a script read-through with Tina Fey, creator and star of 30 Rock.

"He's really funny!" one insider tells OK!. "He fit right in with the cast."

And though a rep for the network says Josh has not been cast, sources tell OK! that he might sign on for a four- to six-episode deal that would have him playing a potential love interest for Tina's character.

"Everyone's excited," says the source. "We wish we could keep him longer."