January Jones Glows in a Preen Dress

Actress January Jones attends the "X-Men: First Class" New York Premiere at the Ziegfeld Theatre on May 25, 2011 in New York City. (Getty Images North America)more pics » January Jones January Jones was glowing in an off-the-shoulder color block knit dress at the 'X-Men: First Class' premiere. The Preen design was perfect for the mommy-to-be!

January wore her hair down for the occasion. She donned Prada shoes to complete her look.

We've spotted other celebrities with a similar look, including Demi Lovato, Rebecca Gayheart, and Katy Perry. Check out all 95 pictures in the Off-the-Shoulder Dress Lookbook.

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