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Along with skinny jeans and the LBD, a black blazer is one of those wardrobe staples that the stars wear all the time, both on and off the red carpet.

Blazers are the ideal piece to pair with skinny jeans (like Pippa Middleton) or with a billowy maxi skirt (like Rachel Bilson). it can even be layered over a sparkly cocktail dress for a chic, downtown look (like Sandra Bullock).

PHOTOS: See what all the stars wore last night!

Click through to see more ways to rock this must-have item.