Ke$ha, Usher and No Doubt are the latest acts to join the lineup of this year's American Music Awards, airing November 18 on ABC.  In addition, Billboard is reporting that Justin Bieber will also be part of the lineup, and he's been announced in promos for the show, but ABC has yet to officially confirm his presence.

Previously-announced performers include Pink, Pitbull, Taylor Swift, Carrie Underwood, Nicki Minaj, Christina Aguilera and Linkin Park.  Winners will be determined by online voting , you can vote now at AMAVote.com or AMA.abc.com.  In addition, tickets for the show, to be held at the NOKIA Theatre L.A. LIVE, are now on sale via Ticketmaster.