Beauty Crush: Jessica Alba Rocks a Daring Hair and Makeup Look

Credit: Jamie McCarthy/Getty Images

What a difference a day makes!

On Monday night Jessica Alba attended Glamour's 2011 Women of the Year Awards in NYC with a simple half-up hairstyle and pretty, yet predictable makeup.

But when she arrived at the H&M for Versace star-studded bash on Tuesday, the 30-year-old mom-of-two gave onlookers a reason to do a double-take.

PHOTOS: See what Jessica, Blake and more stars wore last night!

She styled her shoulder-length hair into a tight, sleek pony that showed off her dramatic lipstick, full lashes and flawless complexion.

VOTE: Which celeb has the best hair?

The actress posed alongside Emma Roberts, Blake Lively and Selma Blair who all hit up the party in fun looks from the limited-edition collection.