The singer picked up the Best Male Video award for "U Smile."
The Beastie Boys seemed especially funny tonight.
The two huge stars joked around as Perry picked up one of her awards.
These amazing kids performed a tribute to Britney Spears, who picked up the Michael Jackson Video Vanguard Award.
Gaga's alter ego presented Brit with her award—and tried to present her with a kiss.
The honeymooner was on hand and looking gorgeous.
The British songbird picked up multiple awards and blew the crowd away with an understated performance of "Someone Like You."
Besides her big news, the singer gave a stellar performance of "Love on Top."
The two hotties introduced a performance by Young the Giant.
These two young pros presented the Best New Artist award to Tyler, the Creator.
Hey, the veteran band won its first MTV award, which was pretty cool. So was watching Dave Grohl get excited to see Queen's Brian May perform with Lady Gaga.
The singer gave a pumped-up version of "Valerie" as a tribute to Amy WInehouse.
The jazz and pop crooning legend took part in the remembrance of Amy Winehouse.
The band performed at the VMAs for the first time, and they brought a bunch of their own fans with them.
The performer gave an athletic performance that pulled him up on wires.
An unlikely pairing? They did just fine up on stage together.
This odd couple introduced a performance by Pitbull.
With Ne-Yo, the rapper rocked the house.
These two worked a little comedy together.
MORE: MTV VMA Arrivals