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One of Hollywood’s most powerful publicists threw a private soiree in her home on Wednesday, and InStyle had exclusive access to the event! Ashlee Margolis co-hosted the bash with scarf label Theodora & Callum, Coach, Shoshanna Swimwear, MyLine Clothing, Beyond Yoga, and shoe designer Matt Bernson, and the party was filled with stars like sultry Mad Men actress Christina Hendricks (in Temperley, Moschino, and Theodora & Callum’s scarf), Hilary Duff (who snuggled up to Paula Patton in Shoshanna), and Anna Kendrick (working Coach’s crossbody), who was the first to arrive. “It is 80 degrees in Los Angeles, so it feels like summer, and this feels like a summer party,” Hendricks told InStyle.com of the event, which allowed stars to try on some of their favorite designs from the popular brands. “Today’s been fun. I’ve just been seeing a bunch of friends. It’s always nice to come to these parties and see the girls you’ve worked with or wanted to work with!” Hendricks proved to be the life of the party, staying for the entire evening and splitting her time between a cozy couch by the pool and mingling with all the guests. What fun!

Plus, see more of the week’s parties!

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— Lindzi Scharf

If your New Year’s Resolution is cleaning out your wardrobe, you’re not alone. Hilary Duff has her sights set on thinning out her collection of 100+ pairs of jeans. “My sister just did a massive closet clean out,” Duff told InStyle.com at the launch of stylist Jessica Paster’s collection for justfab.com last week. “I was so jealous because she had it down to 20 pairs of jeans and I thought, ‘That’s doable.’ There’s no reason why you need more than that. I have about 100 and I don’t even know what I have!” Right now she’ll be holding on to her favorite pair of black skinnies from J Brand‘s maternity line (shown above right). “They’re so comfortable,” she added. So, what about you—how many jeans do you own? Vote in the poll below and let us know!  More