Jack Black and Shirley McLaine ham it up for the cameras at the premiere of their new movie; Kim Kardashian, Busy Philipps and more step out for Us Weekly's Hot Hollywood Style Issue event at Greystone; ASCAP presents their 2012 Pop Music awards to Katy Perry, Carly Simon, David Guetta and others; Emma Roberts and Julia Roberts make a movie premiere a stylish family affair; Rihanna sings for Steven Spielberg, Rita Wilson and many others in Hollywood to benefit breast cancer research—L.A. was hopping with events all over town Wednesday night and we have your details on the best ones that went down in this edition of Last Night's Parties. More»

Jaime King, Fergie and Chloe Moretz attend JustJared.com founder, Jared Eng's birthday party at Pink Taco; Ke$ha, Rose McGowan and Sophia Bush honor entertainment media that raises awareness on animal issues at the 26th Annual Genesis Awards; Kendra Wilkinson and Kim Kardashian celebrate Perez Hilton's birthday with a Mad Hatter-themed tea party at Siren Studios—the rain didn't stop Los Angeles from partying this weekend and we've got the details on the biggest events and the celebrities who attended them in this installment of Last Night's Parties! More»

Kristen Bell and Jane Seymour attend the Alzheimer's Association's "A Night At Sardi's" celebrity musical revue benefit dinner; Analeigh Tipton, Aubrye Plaza and Maggie Grace hit the premiere of Damsels In Distress; Lacoste celebrates the launch of their women's Spring/Summer 2012 collection with a Sunset Tower soiree and special guests Malin Akerman, Jesse Metcalfe and Jenna Elfman—it was another bustling, star-studded Wednesday night in L.A. and we've got all the details in this installment of Last Night's Parties! More»

Sucker Punch alums Abbie Cornish and Jamie Chung attend the 2012 Tribeca Film Festival reception at the Beverly Hilton Hotel; Jason Biggs, Alyson Hannigan and the rest of the original American Pie gang get together at Grauman's Chinese Theatre for the Los Angeles premiere of American Reunion; Kathy Griffin speaks on a panel at the Weinstein Company's screening of Bully—Monday night's parties got the week started off right in Los Angeles and we've got all the details in this edition of Last Night's Parties! More»

Lily Collins is honored at Scarpetta by NYLON + Coach for her lovely appearance on the March cover of NYLON magazine; Magic Johnson reveals never before seen details about living with HIV with the release of his ESPN film The Announcement; Bai Ling takes to the red carpet at the Landmark Theatre for the DVD and Blue-Ray launch of High Road—Tuesday night, Los Angeles was buzzing with film releases, magazine celebrations, charity functions, and what might be the very last award show of the season and we have the lowdown for you on all of it in this edition of Last Night's Parties. More»

George Clooney, Brad Pitt, Viola Davis, Octavia Spencer, Glenn Close, and Jonah Hill were among the stars lighting this year’s Oscar Nominee Luncheon at the Beverly Hilton Hotel. The Academy Award hopefuls sipped mini imperial bottles of Moët & Chandon while mingling with guests in the private room, where Mr. Clooney discussed weekend plans with Mr. Pitt and offered tips to emerging Hollywood directors. More»

Judy Greer, Ariel Winter and more come out to celebrate animated films at the 39th Annual Annie Awards; Miranda Cosgrove, Alexandra Breckenridge and Penelope Ann Miller rock the red carpet at the 16th Annual Art Directors Guild Awards; Amanda Seyfried and Peter Sarsgaard celebrate the wrapping of Lovelace with a DeLeon Tequila-sponsored wrap party at Hollywood hot spot The Writer's Room—get the scoop on this weekend's parties in Los Angeles and the celebrities who attended them in this installment of Last Night's Parties! More»

Jenny McCarthy hosts a World Series of Boxing match; The Producer's Guild honors Angelina Jolie in a celebrity filled night; Kate Beckinsale, Ali Larter and HIMYM star Neil Patrick Harris come out for a legen—wait for it —dary opening night of Cirque du Soleil's OVO in Santa Monica; Selena Gomez sings for UNICEF; The Wonder Girls come to America under the guidance of Nick Cannon—Sundance wasn't the only thing going on over the weekend, see what went down in L.A. in this installment of Last Night's Parties. More»

Prince William, Kate Middleton [via]

Prince William and Kate Middleton are not happy with me right now since I kind of blew them off all weekend and didn't see them once before they left. Do you blame me though? I mean they're kind of a buzzkill. Maybe next time, guys. But the royal newlyweds still had plenty to keep them busy during their stay here in Los Angeles. Within a span of a few hours, they made it to a couple of events and mingled with the likes of everyone from Mayor Villaraigosa to David Beckham. Take a look at where they went, what they wore, and who they partied with in this rundown of their first day in L.A. More»

Hollywood biggies like Annette Bening, Warren Beatty, Martin Sheen and Geena Davis honor women in film while Katie Holmes and Elle Fanning hug it out; AnnaLynne McCord, Samantha Ronson, Ryan Phillippe, Danny Masterson and more young Hollywood celebrate the Joseph Abboud watch collection with Esquire Magazine; Rachel Zoe and Rodger Berman hit the red carpet with baby Skyler and make the lackluster responsibilities of parenthood look chic at Petit Tresor—this and more all went down yesterday and we have the details you care about so come catch up with us on everything from last night's parties. [Photo via] More»