Jason Segel's iPhone Declares: "I Heart Michelle Williams"

Looks like things are getting serious for Jason Segel and Michelle Williams.

The Five-Year Engagement star is romancing Michelle on the sly, but a photo of the actor hanging solo might have blown his cover.

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E! Online snagged a shot of Jason leaving a talk show clutching his phone, with pictures of Michelle in a black-and-white photo booth taped across the back. Printed on the pictures? "I Heart You."

While neither of the actors confirm nor deny the romance, in the past two months Michelle and Jason have been spotted holding hands in New York City and hanging with her 6-year-old daughter, Matilda.

The romance is likely new, however, seeing as Jason told the February issue of Vanity Fair he was single and the "new George Clooney." Not looking to "rush" into a relationship, he said, and was waiting to find someone "awesome."

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Looks like he may have found that in Michelle after Tweeting (and then deleting) last month: "If I fell in love would you guys be happy?"

Yes, we would Jason. Good luck!