Rihanna is rehearsing for her performance at the 2008 American Music Awards. Hot sizzle was happening at the Nokia Theatre L.A. yesterday in Los Angeles! Can’t wait to see her act.

With the pyrotechnics seen here looks as if she’ll put on an explosive show! Boyfriend Chris Brown was also seen in the theater.

Other performance for the night include:

Beyonce, Christina Aguilera, Jonas Brothers, Miley Cyrus, Leona Lewis, Kanye West, Taylor Swift, Alicia Keys, Ne-Yo, Mariah Carey, Coldplay, New Kids on the Block, Pussycat Dolls, P!nk, The Fray and Annie Lennox.

Watch the AMAs this Sunday, November 23 @ 8PM ET/PT on ABC.