Michelle Williams: 'Take This Waltz' with Jason Segel!

Michelle Williams hits the red carpet wearing a Giambattista Valli dress at the premiere of her film Take This Waltz during the 2012 Tribeca Film Festival at the BMCC Performing Arts Center on Sunday (April 22) in New York City.

The 31-year-old actress was joined at the premiere by her co-stars Luke Kirby and Sarah Silverman.

Spywitnesses tell JustJared.com that Michelle‘s boyfriend Jason Segel snuck in the back door of the theater to support his gal on her big night.

Here’s the film’s synopsis: Margot (Williams) and Lou (Seth Rogen) are a happily married couple living a quiet, comfortable existence. Their marriage is filled with love, companionship, and humor, but after years of being together, they have settled for contentment and security over excitement. Their life is thrown out of order when Margot falls in love with a handsome and charismatic neighbor (Kirby), and she is forced to choose between the comfort of the familiar and the exhilaration of the unknown.

30+ pictures inside of Michelle Williams at the Take This Waltz premiere…