Ashley Benson, Heidi Klum, Lady Antebellum, the five reunited members of the Backstreet Boys, Cyndi Lauper and Colbie Caillat will also be handing out awards at Sunday's ceremony.
Additional American Music Awards presenters include 50 Cent, Happy Endings star Elisha Cuthbert, Karmin, Jenny McCarthy, Lucy Hale, Ginnifer Goodwin, Kerry Washington and Gavin DeGraw.
This year's gala will also mark the 40th anniversary of the American Music Awards with performances from Christina Aguilera, Nicki Minaj, Taylor Swift, Jason Aldean, Lady Antebellum, Faith Hill and Linkin Park.
Pitbull, Carrie Underwood and Pink were also recently added to the lineup of performers for the ABC telecast.
Rihanna and Nicki Minaj are this year's American Music Awards nomination leaders with four each, while Justin Bieber, Drake, Maroon 5, Usher and One Direction have all received three nods.
The 40th annual American Music Awards airs live from the Nokia Theatre in LA at 8/7c on Sunday, November 18.
Watch Rihanna's 'Diamonds' music video below: