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January Jones, Emilia Clarke, Scarlett Johansson, Jennifer Connelly, Emma Watson

Carlos Alvarez/Jamie McCarthy/Ian Gavan/Getty Images

It's officially springtime, and there must be something in the air because the stars looked especially chic this week.

Let's start right off the bat with Scarlett Johansson at the Captain America: The Winter Soldier premiere in London. Please excuse us while we pick our jaws up off the ground. This Vivienne Westwood look is classic ScarJo through and through: figure-flattering and red hot. The actress successfully conceals her tiny baby bump, and we love that she updated this retro look with leopard heels.

Emma Watson also stunned at the Madrid premiere of her movie Noah. She bucked the dress trend and went for a cool J. Mendel silk jumpsuit instead, and it really paid off. Swideswept hair and a dramatic berry lip completes the look.

Also looking chic at the Noah premiere was Jennifer Connelly, who celebrated spring in a mini mint frock by Giambattista Valli Haute Couture with bejeweled detailing at the collar.

Then there's January Jones who really worked the nautical stripes trend at the Rebel With a Cause event in Hollywood. She stepped out in a fresh Topshop frock, a Jimmy Choo clutch and heels.

And last but not least this week is Emilia Clarke at the Game of Thrones premiere in New York. She wore a belted Donna Karan number with a plunging neckline. There's a whole lot of material to this dress, but somehow it doesn't overwhelm her frame. Love!