This year’s shindig will be hosted by Dick Clark, Ryan Seacrest and Melissa Rycroft from New York City’s Times Square, while Fergie will be hosting live from Las Vegas.

If you weren’t invited to the town’s hottest parties, you can always tell your friends you rocked out with The Black Eyed Peas, Selena Gomez, Justin Bieber, Keri Hilson, Colbie Caillat, Orianthi, Chris Daughtry and Robin Thicke.

Cheers from Celebrific!

The musical extravaganza catered to all types of fans. R&B/hip-hop lovers grooved to the tunes of Ne-Yo, Flo-Rida, Janet Jackson, and Dizzee Rascal. Boy band hysterics partied like it’s 1999 with Westlife and the Backstreet Boys. The Sugababes, JLS, and Pixie Lott showed off their UK flair with their latest hits. The Noisettes and Metro Station added some rock flavor to the scene.

The event’s showstoppers were the sexy popstars who dressed like it’s the last day of 2009. There was Lady Gaga who proudly made it to Santa’s naughty list, thanks to her “cherry, cherry, boom, boom” bikini. There was teen sensation Miley Cyrus who raised eyebrows with another provocative outfit. The Saturdays opted for skimpier costumes for their performance. Shakira’s hips didn’t lie as she performed “Whenever, Wherever” onstage.

The two-day show was a success, if you count the 16,000 people who attended day two alone. Fans of all ages uploaded their personal accounts of the event on Capital FM’s website.

Lady Gaga was ushered into the venue as Santa’s reindeer. She quickly changed into a red-hot bikini, fishnet stockings, black lace-up boots, and her famous disco stick when she hit the stage for her six-song set. Check out her red-hot outfit here.

Miley Cyrus brought the “Party In The USA” to London wearing her trademark ultra short shorts, open shirt, and revealing bra.

American Idol Jordin Sparks performed her hit “Battlefield.”

Jade Ewen, Heidi Range and Amelle Berrabah of the Sugababes

Shakira sported another crazy ’do, but her swinging hips did a good job.

That didn’t stop the musical guests from giving earth-shaking performances. Beyonce Knowles not only bagged the best female artist award and best song award for “Halo,” but also wowed the audience with her racy red outfit as she performed her hit “Sweet Dreams.”

Wall-to-wall would be an understatement for Katy Perry’s costume changes and hosting skills. From her various red carpet frocks to her glittering stage costumes, Perry’s wardrobe did not disappoint fans that night.

Other highlights included performances by Green Day, Tokio Hotel and Leona Lewis. For a complete list of winners and a gallery of red carpet garbs, visit the official MTV Euro site.

Some 16,000 students and teachers attended the musical event. Guest performers such as The Jonas Brothers, Justin Bieber, Hedley and dancers from So You Think You Can Dance Canada were received with ear-splitting cheers from the crowd.

The event wasn’t just about a cool concert. The kids and teens in attendance were in full support of the organization’s cause—to make tangible actions that make a better world, especially for children. Humanitarians, environmentalists, motivational speakers and politicians were greeted like rockstars at the event.

SOS call: The Jonas Brothers made a surprise appearance.

Justin Bieber performed the acoustic version of his hit “One Time” at We Day.

“We share with our team and we truly believe it’s not about us. It’s about the issues and we share that with all the young people,” said Marc Kielburger, one of the founders of Free The Children. “We’re just happy that the young people feel that it’s really cool to get socially engaged and what we’re fighting most of all is we’re fighting apathy.”

“Everyday action is our message and people respond to that message because they’re really searching to bring about a positive change in this world,” added co-founder Craig Kielburger.

With the success of the rally, it looks like the kids heard the message loud and clear.

For more info about helping fight child labor, visit www.freethechildren.com.