Entertainment Tonight.

Are they? Aren't they? That's the question when it comes to Jonah Hill and his on-again, off again girlfriend Jordan Klein after the two were caught kissing at a Starbucks in North Hollywood on May 22 according to People.com.

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"They were walking toward Starbucks," a source tells PEOPLE. "Then the next thing we knew, he grabbed the back of her head and started passionately kissing her on the side of the street."

The 21 Jump Street star and his lady-love dated for approximately four years before breaking up back in October 2011. Sporting jeans and a blue T-shirt, Hill walked into the Starbucks with Klein where they ordered a latte, two iced coffees, bagels and cream cheese.

"As soon as they sat down they started kissing again," the source added. "They were so into each other, it was like there was nobody else in the store, actually I think they forgot where they were, it went on for at least five minutes."

 A former New Yorker, Hill announced his move back to Los Angeles via Twitter last month.

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