The Insider.com

Olivia Wilde hit up not one, but two, events yesterday, showing us all how to expertly switch it up from a daytime to nighttime look.

• October 21, 2011Miss Piggy Limited Edition MAC Collection Confirmed
• October 20, 2011Christina Aguilera's Makeup, Pants-Less Dinner Date
• October 19, 2011What the face, Lindsay Lohan? Part 2
• October 19, 2011Uma Thurman's Va Va Voom Hair
• October 18, 2011Paula Deen's Butter-Flavored Lip Balm
• October 17, 2011Sienna Miller Comb Your Hair

The sexy star first attended a 2011 CFDA Vogue Fashion Fund event at the Chateau Marmont in L.A., looking every bit the lady in a knee-length pink dress under a cherry red coat. She accessorized the girly outfit with a pair of blue heels and a matching blue clutch, giving the outfit a great pop of color. Lastly, she sweetly put her hair in a ponytail with side-swept bangs, putting the finishing touches to a pretty, and super classy outfit.

... And then it was time to sex it up for the night!

Olivia dazzled in a backless black gown at the L.A. premiere of In Time, where she let out her hair into tousled waves and kicked off her cute blue pumps for a fierce pair of strappy black heels and an animal print clutch. Her makeup was still smartly minimal because let's get real -- with a face like that do you really need all that much?

And that, friends, is how Olivia Wilde expertly goes from day to night!

MORE: Justin Timberlake: Olivia Wilde is Hottest Movie Mom Ever