Credit: Jim Spellman/ (2); Mike Marsland/

Jacket required?

Several fashion forward celebs have been topping off flouncy evening gowns with fitted blazers.

"The jacket adds toughness and an element of cool," stylist Annie Ladino, who has worked with Julia Roberts, tells Us Weekly. "It's a standout look."

Olivia Palermo rocked a Willow blazer with an ivory lace dress and glittery Zara sandals at the premiere of I Don't Know How She Does It in New York City on September 12. Sarah Jessica Parker paired an Oscar de la Renta gown with a black blazer at the premiere of Harry Potter and The Deathly Hallows: Part 2 in NYC on July 11, while Emma Watson also wore an Oscar de la Renta design with an Antonio Berardi jacket at the film's London premiere.