Jason Segel and Michelle Williams: Total PDA Alert!

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This just in: Mason is totally on!

Jason Segel premiered his latest comedy, The Five-Year Engagement, in New York City last night and witnesses at the after-party confirm that he and new girlfriend Michelle Williams were totally macking on each other all evening.

Jason Segel Movie Premiere Pic
Michelle Williams at the Spirit Awards

"Michelle didn't do the red carpet but wanted to be there for Jason's big night," an insider tells Us Weekly. "She snuck in to sit in the theater during the screening, then they all went over to the after party together where they were hanging out with his co-star Emily Blunt and Robert De Niro."

The source goes on to describe Segel and Williams as possessing serious "physical chemistry," with the actor pecking his shy gal pal on the cheek many times and onlookers melting in their presence.

"Every actor in there was so enamored by the couple!"

Segel spoke on the relationship for the first time this week, keeping it short, simple and cute by telling Extra: "I think we would just very much like to be happy. That's all I'm going to say about it."

[Photos: WENN.com]

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