The singer, whose birthday is Tuesday, intends to show off her more adult side with a rendition of her single "Forgiveness and Love" at the 2010 American Music Awards on Sunday.
Justin Bieber also hopes to make a splash with his new single "Pray," and will be putting on a huge number with a band and some surprise guests.
Bieber, Usher, Lady Antebellum and Eminem are all nominated for multiple awards.
The show will broadcast live from the Nokia Theatre L.A. Live on Sunday at 8 p.m. ET on ABC.