The Canadian band scooped International Group and International Album (for ‘The Suburbs’) at the London O2 Arena ceremony, which was hosted by James Corden.
Meanwhile, Tinie Tempah took home the prizes for British Breakthrough Act and British Single for ‘Pass Out’.
Elsewhere, Take That won the British Group gong for the first time in their career after opening the show with a performance of their latest single ‘Kidz’.
Plan B walked away with the British Male Solo Artist prize and also played a medley of tracks from the ‘The Defamation Of Strickland Banks’, a performance which saw a stuntman set on fire.
Rihanna won the International Female prize before performing her own medley of hits. US singer Cee Lo Green scooped the male equivalent of the award before closing the show with his UK Number One single ‘Forget You’, which saw him duet with Paloma Faith.
Other winners on the night included Justin Bieber, who took home the International Breakthrough prize, and Jessie J, who collected her Critics’ Choice award.
Adele, who wasn’t nominated for any awards, performed ‘Someone Like You’, a track from her latest album ’21’, during the show.
See Brits.co.uk for more information.
The full list of winners from the Brit Awards 2011 is:
MasterCard Album Of The Year: Mumford and Sons – ‘Sigh No More’
British Band: Take That
British Single: Tinie Tempah – ‘Pass Out’
British Male Solo Artist: Plan B
British Female Solo Artist: Laura Marling
British Breakthrough Act: Tinie Tempah
International Album: Arcade Fire – ‘The Suburbs’
International Group: Arcade Fire
International Male Solo Artist: Cee Lo Green
International Female Solo Artist: Rihanna
International Breakthrough: Justin Bieber
Critics’ Choice: Jessie J