The 54th Annual Grammy Awards takes over the Staples Center; Paris Hilton and Afrojack attend EMI's Grammy after party; Tony Bennett and Diana Krall perform at Clive Davis and The Recording Academy's Pre-Grammy Gala; Ne-Yo and Compound Entertainment throw a Pre-Grammy midnight brunch; Kelly Clarkson and John Legend attend Sony Music Group's Grammy Reception at Cecconi's; Bruno Mars performs at Warner Music Group's Grammy Celebration hosted at Chateau; Jay-Z's Roc Nation holds a pre-Grammy brunch at Soho House; MusiCares honors Paul McCartney as person of the year and raises $6.5 million for artists; Cash Money Records holds their 3rd annual pre-Grammy Awards party with Lil Wayne and Drake; Flo-Rida and Pia Toscano rock the house at OK! Magazine's pre-Grammy event—Los Angeles was alive with music this weekend and we've got your inside scoop on all the festivities and the celebrities who attended them in this edition of Last Night's Parties!

[Rashida Jones, Nicole Richie via]

Aubrey O'Day Evan Ross Michelle Trachtenberg Mario Lopez Katy Perry Elvis Costello Natasha Bedingfield Steven Van Zandt Julianne Hough Ne-Yo carrie underwood Serena Williams Will.I.Am benji madden Michelle Williams Richard Branson Andre Leon Talley Britney Spears Alicia Keys Kate Beckinsale Rihanna gabrielle union Ciara Q-Tip Steve Martin Melanie Fiona The Black Eyed Peas Ice-T Cyndi Lauper Gayle King Hugh Hefner Rashida Jones Tom Hanks Taylor Swift Alicia Arden Daisy Fuentes Amber Rose Diane Warren Kim Kardashian John Legend Nicole Richie Lupe Fiasco Kathy Griffin LA Reid Coco Rick Ross Sanaa Lathan Rita Wilson Kelly Rowland Yoko Ono Val Kilmer LL Cool J Jeff Tweedy Adam Lambert Estelle Tony Bennett Neil Patrick Harris rosanna arquette John Stamos AJ Calloway Les Moonves Julie Chen QuestLove Kelly Clarkson Garcelle Beauvais-Nilon Busta Rhymes Flo Rida Paul McCartney Ariel Foxman Kelly Osbourne Billy Ray Cyrus Common Valerie Simpson James Taylor Lily Aldridge Lykke Li Kelis toni braxton Ryan Seacrest Wale Larry King Matthew Morrison Dr. Dre Sonja Morgan minnie driver Ellen Pompeo Deadmau5 Sean Parker Steven Tyler Penny Marshall Herbie Hancock Keke Palmer David Guetta India.Arie Jay Sean Kendra Wilkinson Nicole Polizzi Cheryl Burke Paris Hilton