The Garden State funnyman, 30, and singer/actress, 21, starting dating exactly a year ago, but have refused to confirm they were a couple until now.
He says, "Mandy is an amazing comedian and I don't think a lot of people have gotten the chance to see her do broad, physical comedy. It really gave her a chance to show off that side of her."
George Clooney and Teri Hatcher an Item?
The showbiz twosome have "quickly become close" after realizing they were neighbors, and have been seen dining at Clooney's favorite restaurant, Casa Vega, in San Fernando Valley.
A source tells British paper the News of the World, "They've been out a few times and been seen enjoying romantic dinners. "It's early days but they have become close very quickly. Things definitely look like they are getting more serious.
Dominic Monaghan and Evangeline Lilly Engaged
British actor Dominic Monaghan and his Lost co-star Evangeline Lilly are reportedly engaged.
Monaghan got down on one knee to propose to his girlfriend on the Hawaii set of the hit series last week, to which Lilly replied "Yes, yes, yes!"
A source says, "They want to spend the rest of their lives together."
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