11/21/2011 08:29 am ET Updated Jan 21, 2012

American Music Awards; Inside The Show (PHOTOS)

The stars were out for the American Music Awards Sunday night. Justin Bieber, Katy Perry, Jennifer Lopez and Taylor Swift joined a number of other celebrities from all walks of Hollywood, who were all dressed up to party down in Los Angeles.

Swift sat with BFF Selena Gomez, danced in 3D glasses with competitor Katy Perry and headed to the stage to accept the award for Artist of the Year.

The night was a combination of random duos, awesome performances and memorable moments, including our favorite fictional mother-daughter duo, Julie Bowen and Sarah Hyland, presenting Bruno Mars with his award. But perhaps most notably, David Hasselhoff hitting the stage with LMFAO, dancing in his underwear and the infamous "Don't Hassel the Hoff" t-shirt.

For a closer look at scenes from the show, check out the gallery below.


Inside The American Music Awards