Diane Keaton and John C. Reilly fete photographer Matthew Rolston's new book; Vera Farmiga and her "Bates Motel" costars spend an evening with The Paley Center; Halle Berry, Andy Garcia, and Julie Bowen help lead the way at the EIF Revlon Run/Walk for Women; Demi Lovato, Adam Levine, Britney Spears and dozens of other pop stars hit KIIS FM's Wango Tango; Tyler Perry, Angela Bassett and Lisa Vanderpump waltz through the CARRY Foundation's annual "Shall We Dance" Gala; John Legend joins Stevie Wonder for his 63rd birthday celebration—get caught up on the weekend's top happenings in this edition of Last Night's Parties.

Lake Bell, Aisha Tyler and Rob Schneider celebrate the Golden Trailer Awards; Elton John performs for guests like Rod Stewart, Kelly Osbourne, Neil Patrick Harris, Tommy Hilfiger, and more at the Race To Erase MS Gala; Ellen Hollman, Katrina Law and others attend a BritWeek celebration of "Downton Abbey"; Jason Bateman, Portia De Rossi and fellow Bluth family members step out for an "Arrested Development" press event; Amber Valletta, Angie Harmon, Monique Lhuillier and other fashionistas toast the forthcoming Wallis Annenberg Center for the Performing Arts with Ferragamo at Gagosian Gallery; Cobie Smulders, Mike White, and more dance for cancer research—get caught up on the weekend's top happenings in this edition of Last Night's Parties.

Victoria Justice and other musicians hit the stage for the Big Time Rush tour announcement; William Draven, Bai Ling, and fellow stars walk the blood-red carpet for the Los Angeles premiere of Stitches; Magic Johnson, George Lopez, Sandy Koufax and a stadium full of fans including unofficial mascot, Dodger Elvis, attend "A Brand New Blue" opening day event at Dodger Stadium; 98.7 FM contest winners and special guests rock out to a private rooftop show featuring Alkaline Trio at the historic Hollywood Tower—get your party fix with the top events from Monday in this edition of Last Night's Parties.

We are officially one week into spring and could not be more thrilled about retiring our winter wardrobe until next year in exchange for months of bold colors, playful prints and short hemlines. Hollywood seems to share our excitement for the changing of the season, stepping out to L.A. events over the last week in fresh, vibrant looks that prove the season of love and renewal is definitely upon us. Check out who we think hit it biggest showing off the season's hottest trends and styles with these top 10 looks from the first week of spring. More>>

We are officially one week into spring and could not be more thrilled about retiring our winter wardrobe until next year in exchange for months of bold colors, playful prints and short hemlines. Hollywood seems to share our excitement for the changing of the season, stepping out to L.A. events over the last week in fresh, vibrant looks that prove the season of love and renewal is definitely upon us. Check out who we think hit it biggest showing off the season's hottest trends and styles with these top 10 looks from the first week of spring.

Johnny Depp, Katy Perry, Selena Gomez, Kristen Stewart and many other young faces in Hollywood attend Nickelodeon's Kids' Choice Awards; Solange performs at the Diesel + Edun Studio Africa event at Ron Herman; Kerry Washington and Lance Bass are among the guests at the Human Rights Campaign Los Angeles Gala Dinner; Brad Goreski and Whitney Port sit on a panel at the 2nd Annual Simply Stylist L.A. fashion and beauty event; Chloe Sevigny, Alexander Skarsgard, Jeffrey Deitch and a slew of others join Olivier Zahm for a Purple Magazine party—get caught up on L.A.'s top weekend events in today's edition of Last Night's Parties.

Adrian Grenier, Heather Graham and more celebrate next month's Tribeca Film Festival; Gerard Butler, Aaron Eckhart, Ashley Judd and Morgan Freeman hit the red carpet at the premiere of Olympus Has Fallen; Emilia Clarke, Peter Dinklage, Lena Headey and other stars of HBO's "Game of Thrones" step out for the Season 3 premiere; Ryan Seacrest, Emmy Rossum, Nikki Reed and more join Justin Timberlakee at his 20/20 album release party—Monday was buzzing with star-studded events and we have the rundown on them all in this installment of Last Night's Parties.

Adrien Brody, Heather Graham and Josh Hartnett step out for The 6th Annual Hollywood Domino and Gala to benefit Artists For Peace and Justice; Harvey Weinstein and Chris Tucker attend the Weinstein Company and Lexus presentation of the "Life is Amazing" short film series; Analeigh Tipton, Ron Howard, Hans Zimmer, Lake Bell and others continue the pre-Oscar festivities with Vanity Fair and Fiat; Allison Williams, Anna Paquin, Elton John and more join Tom Ford for cocktails to support Project Angel Food—get the lowdown on the top events of Thursday in this edition of Last Night Parties.

The amazing looks continued as the Fashion Week shows and after parties rolled on yesterday. But the night wans't all about Fashion Week, as some impeccably-dressed ladies stepped out for two different premieres in their very best red-carpet attire. Click through to find out the best dressed guests from all of the evening's festivities.

Last night in NYC, Laure Heriard Dubreuil and Saloni Lodha hosted a dinner at the Standard East Village to celebrate the launch of David Dunan's book "Nomadic Interlude," Jessica Stam and Zoe Kravitz hit up Marc Jacobs after party at the Harvard Club, Phillip Lim got behind the DJ booth at Santos Party House for his post-show celebration, and so much more!

Judd Apatow, Leslie Mann, Maude Apatow via

Nikki Reed, Minnie Driver, Mark Salling and others celebrate "The Scenemakers" with Express and Vogue at Chateau Marmont; Neil Patrick Harris and David LaChapelle attend the opening of Art Platform - Los Angeles; Hailee Steinfeld, Sarah Hyland and many more step out for Teen Vogue's Young Hollywood party; Tom Hanks, Billy Crystal and Martin Short give a Shakespeare reading at UCLA; Kevin Connolly and Jamie Chung hit the Hotel Noir premiere—see how L.A. got a pretty aggressive head-start on weekend festivities in this edition of Last Night's Parties.