Michelle Williams attends 'Five-Year Engagement' premiere with Jason Segel

"My Week With Marilyn" actress Michelle Williams stepped out with boyfriend Jason Segel at the premiere of his new movie, "The Five-Year Engagement," Wednesday (April 18) night.

Vanity Fair reports that the couple held hands at the after-party while talking to guests like Robert De Niro, Elizabeth Banks and Julia Louis-Dreyfus -- though Segel and Williams avoided being photographed together.

"They are smitten and very serious," a source told Us Weekly in March.

What do you think of Segel and Williams as a couple?