Jessica Biel & Justin Timberlake Elle Dinner Party Pictures

LA's Chateau Marmont hosted Jessica Biel, Justin Timberlake, Jon Hamm, Jennifer Westfeldt, Hailee Steinfeld and more for a private dinner thrown by Elle magazine's creative director Joe Zee and Tod's last night. Justin joined girlfriend Jessica for the chic soiree, but over the weekend he stepped out for a date with another lucky lady. Staying true to his word, JT accompanied Corporal Kelsey DeSantis to this year's Marine Corps Ball. He later described the experience as "moving" and his date admitted JT "brought sexy back" when he hit the dance floor.

At last night's event, Hailee was all smiles in a black Chloë Sevigny for Opening Ceremony laser cut frock and Jessica chose a gray dress from designer Roland Mouret. Inside the party, good-looking guys Jon and Justin chatted before dinner while The Office's Mindy Kaling chatted with friends. It's been an exciting week for Mindy, who partied on Monday with Nicole Richie, Busy Philipps, and Jimmy Kimmel at a celebration for her new book, Is Everyone Hanging Out Without Me?.