Justin Bieber, Katy Perry, Ke$ha To Perform At American Music Awards

They join previously announced performers Christina Aguilera, Pink and Usher.

The star power at the upcoming American Music Awards just got kicked up a notch — or 20. In addition to the previously announced performance from Christina Aguilera, the November 21 show at the Nokia Theatre in Los Angeles will feature the debut AMA appearances from three of music's hottest young stars.

Justin Bieber, Katy Perry and Ke$ha will all perform at the show alongside a roster of veteran acts including Bon Jovi, Pink and Usher. Fittingly, all three newbies are also nominated for Artist of the Year, a category that features heavy-hitters Eminem and Lady Gaga as well. Em and Lady Antebellum lead all nominees with five apiece.

"As a small-town kid from Canada, I never imagined that I would be nominated for AMAs, let alone be performing on the show," Bieber said, according to The Associated Press, which added that the 16-year-old professed to feel "extremely humbled and honored" by the invitation to play the show.

More presenters and performers will be announced in coming weeks.

"Justin, Katy and Ke$ha have been on the top of the charts all year long. We are happy to see each of them make their own AMA history," AMA producer Larry Klein said in a statement announcing the additions. Bieber is nominated in four categories overall, while Ke$ha and Perry are up for three awards.

Winners will be determined by online voting at AMA.ABC.com.

Who are you most excited to see perform at the AMAs? Let us know in the comments!