Jason Segel Breaks His Silence About Dating Michelle Williams -- Kind of!

The actor admits that he's in a relationship with the blonde beauty, but he's not giving out any details

Jason Segel isn't one to kiss and tell! When it comes to his new romance with Michelle Williams, the actor is being a perfect gentleman. But now that their relationship has gone public, he's had to field questions about the Academy Award nominee.

The comedic actor, 32, finally broke his silence when Extra asked about his future with the My Week With Marilyn star, 31.

"I think we would just very much like to be happy. That's all I'm going to say about it," the actor said while promoting his upcoming comedy, The Five-Year Engagement, with costar Emily Blunt.

Blunt herself gushed about Segel's recent transformation: "He's a man-boy! He used to be a boy-boy and now he's a man-boy."

Joked Segel: "I think I might even be becoming a man-man... potentially!"

Self-deprecating humor aside, insiders tell Us Weekly that the funnyman has been much more mature since he started dating Williams. A source said he "has been trying to be more of a grown-up lately" to show his "commitment" to the single mother and her 6-year-old daughter, Matilda.

"He is taking care of himself more, exercising, eating right and dressing better," the source says. "Basically, not acting like a frat boy anymore."

The duo was first introduced by Williams' best friend Busy Phillips, who has known Segel since they starred in the short-lived Judd Apatow series Freaks and Geeks. Williams and Segel were just pals for years, but their recent relationship seems to have developed seemingly out of nowhere.

It "kind of happened overnight!" a source says.

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