Fun was definitely on the menu for the '2011 American Music Awards' (Sun., 8PM ET on ABC). The night was absolutely packed with memorable performances and surprise guest stars. Fighting Gravity went unannounced, but certainly helped make the debut of will.i.am's collaboration with Jennifer Lopez on 'T.H.E. (The Hardest Ever)' one of the most memorable of the night.

Other surprise appearances included a couple of guests who crashed the party at the end of the night with LMFAO performing their two hits. First, Justin Bieber broke out his dance moves on 'Party Rock Anthem,' and then David Hasselhoff joined the boys and Quest Crew to shake his moneymaker on 'Sexy and I Know It.'

From top to bottom, it was a night packed with great musical performances, and plenty of guest stars performing with other acts. Taylor Swift had a great night, picking up Artist of the Year, along with two other awards. Only Adele matched her with three awards of her own, though she wasn't in attendance due to recovering from throat surgery.

Here is the complete list of winners:

- Artist of the Year: Taylor Swift

- New Artist of the Year: Hot Chelle Rae

- Pop/Rock Female Artist: Adele

- Pop/Rock Male Artist: Bruno Mars

- Pop/Rock Band, Duo or Group: Maroon 5

- Pop/Rock Album: Adele, '21'

- Rap/Hip-Hop Artist: Nicki Minaj

- Rap/Hip-Hop Album: Nicki Minaj, 'Pink Friday'

- Soul/R&B Female Artist: Beyonce

- Soul/R&B Male Artist: Usher

- Soul/R&B Album: Rihanna, 'Loud'

- Country Female Artist: Taylor Swift

- Country Male Artist: Blake Shelton

- Country Band, Duo or Group: Lady Antebellum

- Country Album: Taylor Swift, 'Speak Now'

- Adult Contemporary Artist: Adele

- Alternative Rock Artist: Foo Fighters

- Latin Music Artist: Jennifer Lopez

- Contemporary Inspirational Artist: Casting Crowns