Katy Perry

Nickelodeon's 26th annual Kids' Choice Awards were held on Saturday night at USC's Galen Center in LA. Josh Duhamel took over the hosting duties of the slime-filled show and his pregnant wife, Fergie was by his side to show her support. Sandra Bullock was just one of the famous faces to get covered with green goo, along with Kirsten Stewart, whose matching Osman ensemble was doused with slime after she picked up the award for favorite actress. Other big honors went to Katy Perry, who won favorite female singer, and Selena Gomez, who took home favorite TV actress for her work in Disney's Wizards of Waverly Place. Johnny Depp was also on hand and went home with Nickelodeon's honor for favorite movie actor.

Much more excitement went down at tonight's show, so click through to see the rest of the fun snaps!

Jessica Alba and Drew Barrymore were joined by a host of other stylish celebrities last night when they celebrated the launch of Tommy Hilfiger's new West Coast flagship store in West Hollywood. Drew and Jessica both wore Tommy Hilfiger outfits as they worked the red carpet with the designer and his wife, Dee. Jessica's latest public appearance was much less dramatic than the one she made on Jimmy Kimmel Live! on Tuesday when she took part in a celebrity kissing booth and revealed her recent health scare.

Other famous attendees included Katy Perry, Olivia Munn, and Julianne Hough. Julianne was back in LA after a busy few days of press for Safe Haven in NYC, and dropped by the event sans boyfriend Ryan Seacrest, who attended the Topshop/Topman store opening nearby. Despite two fashionable bashes taking place in the same city, there were many stars who managed to attend each. Julianne, Jennifer Lopez, Estelle, and Jessica Lowndes all squeezed both events into their schedules.

The Grammy Awards in LA on Sunday night gave music's biggest names a chance to mingle inside the show once the red carpet wrapped up. Jennifer Lopez and Casper Smart laughed it up with Nicole Kidman and Keith Urban in the audience while Portia de Rossi and Ellen DeGeneres got goofy with Katy Perry. Lena Dunham showed loved to boyfriend Jack Antonoff and Beyoncé chatted up Adele. Carey Mulligan congratulated her husband Marcus Mumford after his win with Mumford and Sons, but that's not all that happened — click through for more fun moments from the Grammys!

Music industry stars made their way to the Beverly Hilton for Clive Davis’s pre-Grammy gala in LA Saturday night. The annual event honors industry icons, and this year's bash celebrated L.A. Reid. The event will also remember Whitney Houston, who died on the day of Clive's party one year ago. This week Clive shared that he planned on doing "something to remind everybody that her talent lived among us and in so many people."

Despite the sad anniversary, stars arrived ready to party, with Miley Cyrus stepping out in a sexy Emilio Pucci dress to mingle with pal Katy Perry. Katy, in a white Rafael Cennamo gown, showed PDA with boyfriend John Mayer inside, while couple John Legend and Chrissy Teigen posed together on the red carpet. Nicole Richie made a solo entrance, and Jordin Sparks rocked Roberto Cavalli. Johnny Depp made an appearance after attending the MusiCares gala on Friday night. A few famous faces in sports stepped out for the fun, including San Francisco 49ers quarterback Colin Kaepernick and Olympic swimmer Ryan Lochte.

Stars got a head start on the Grammys celebrations with a special event honoring Bruce Springsteen in LA last night. The MusiCares Person of the Year gala brought out Katy Perry, who is nominated and will present at Sunday's Grammys, as well as Chrissy Teigen and John Legend. John performed after returning to the West Coast with Chrissy from a visit to NYC, where they attended the amfAR Gala. Faith Hill and Tim McGraw walked the carpet and also took the stage together, and Marcus Mumford hung out backstage with Johnny Depp after singing with Mumford and Sons. Bruce, the man of the hour, rocked the crowd with a performance himself, while Elton John, Sting, and others looked on. There's more Grammys fun to come before the big show — make sure to watch right here on POPSUGAR live Sunday at 4:30 p.m. EST/1:30 p.m. PST for all the action!

Katy Perry donned a glamorous green Yves Saint Laurent gown to step out at the Celebration of Carole King and Her Music event at Dolby Theatre last night in Hollywood. Katy linked up with honoree, Carole, to hit the red carpet for the charitable evening benefiting Paul Newman's The Painted Turtle camp, which provides children suffering from serious illnesses with a Summer camp experience. Also in attendance were Alicia Keys, Jack Nicholson, and Daryl Hannah. Katy and Alicia honored Carole's legacy by performing covers of her greatest hits and teaming up for a duet on stage at the tribute concert. It was a change of pace for Katy, who has herself been an honoree recently. On Sunday, Katy was honored at the Trevor Live annual benefit in LA and she was also awarded Billboard's woman of the year statue last week in NYC.

Katy Perry and Selena Gomez put on their party finest for last night's UNICEF Snowflake Ball at Cipriani 42nd Street in NYC. The girls hit the blue carpet before heading inside for dinner and mingling. Katy wore a Naeem Khan caped ensemble, while Selena showed a bit of skin in Dolce & Gabbana. It was a colorful night for the female attendees — Kate Mara donned orange Jason Wu, Uma Thurman picked a dark blue Atelier Versace gown, and Girls star Allison Williams picked a mint green Naeem Khan ensemble. The night was about doing good, and quite a bit of charity took place. Selena tweeted, "So proud to be a part of UNICEF — we raised 2.5 million dollars tonight!"

David Beckham brought along his Galaxy teammate Robbie Keane to sit courtside at last night's Lakers game in LA. A usual face in the front row at the Staples Center, David cheered on the basketball squad with Robbie, an Irish player, on one side and Adam Levine on the other. Adam and David got into the action, though only one brought along their significant other — Adam had his model girlfriend, Behati Prinsloo, by his side, but Victoria Beckham stayed home. Despite the sports action, Adam still took time to send his well wishes to those suffering in the wake of Hurricane Sandy on the East Coast. Adam tweeted, "Sending love to those who need it on the east coast. You are all in our thoughts."

There were plenty more stars on hand in addition to David and Adam. Katy Perry stayed close to her dad and far away from her ex-husband, Russell Brand. Zac Efron was also there to cheer for the Lakers despite their 91-99 loss to the visiting Mavericks.

Victoria Beckham, Jennifer Aniston, Gwen Stefani, and more stepped out for the CFDA/Vogue Fashion Fund at LA's Chateau Marmont yesterday afternoon. Jen hung out alongside Tobey Maguire and Isla Fisher for the outing hosted by Vogue's West Coast editor, Lisa Love, and the publication's fashion news director, Mark Holgate. She also posed for pictures with Tobey's wife, Jennifer Meyer, who presented her jewelry collection for the fund. Meanwhile, Gwen, who wore a revealing tuxedo-style suit that showed off her bra, mingled with a Wes Gordon-clad Katy Perry for some fashionable fun, and Victoria, who sported a look of her own design, cozied up with Anna Wintour for the runway show honoring the fund's 2012 finalists. Other fashionable A-listers in attendance included January Jones, Rachel Zoe, and Emma Roberts.