January Jones might be sporting a baby bump now, but if she ever feels like she's having a "fat" day, she can look at these pics to feel good!

The Mad Men actress stars in 20th Century Fox's X-Men: First Class, in theaters today, as Emma Frost. She joins a list of hot Hollywood actresses who have appeared in the franchise including Halle Berry, Rebecca Romijn and Famke Janssen.

The role could help Jones make the leap from small-screen star to big-screen A-lister: First Class has been getting rave reviews, with an 87 percent approval rating from critics on

Check out another pic of January in lingerie (it's sparkly, this time) after the jump!