Everyone has had their fair share of slumber parties, but we can bet none have been this chic. Last night, Derek Blasberg joined forces with Dolce & Gabbana to host an A-list "Pyjama Party" at the Chateau Marmont, complete with pillow fights and cocktails (we didn't spot any toenail painting but who knows?!). Jessica Alba, Joan Smalls, and Poppy Delevingne were just a few of the It Girls who climbed into bed with Derek, proving that this junior high tradition is still alive and well. Click through for an inside look!

Who was there: Guests included Jessica Alba, Naomi Campbell, Nicole Richie, Emily Ratajkowski, Selma Blair, Camilla Belle, Poppy Delevingne, Juno Temple, Joan Smalls, Amber Valletta, Dasha Zhukova, Vanessa Traina, Rachel Zoe, Jamie Chung, Kelly Sawyer, Talita Von Furstenberg, Jennifer Meyer, Derek Blasberg, Will Peltz, Adam Senn, Noah Mills, and Cagatay Ulusoy.

[Photos by Billy Farrell/BFA.com]