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Fireworks, dancers, giant hearts... We take a look at the best performances at the O2 Arena.
Even in rehearsals, it was clear to see that Olly would put on an incredible show.
Olly wasn't the only artist who showed why they're up for a gong in rehearsals...
Blur rehearse for their first live performance since their 2009 comeback shows at Glastonbury and Hyde Park.
Coldplay performed their hit Charlie Brown, taken from their last album Mylo Xyloto.
They promised fireworks, and they delivered fireworks!
Florence Welch first performed at the BRIT Awards in 2010, when she was joined onstage by Dizzee Rascal.
She wowed the crowd with a fantastic version of her hit No Light, No Light, taken from her sophomore album, Ceremonials.
Florence Welch was joined by a host of dancers in a spectacular show at the O2
Heart Skips A Beat was nominated for the Best Single category, losing out to One Direction's What Makes You Beautiful.
Olly jumps into action on a beautifully designed set.
Olly was joined by Rizzle Kicks for a blistering performance of Heart Skips A Beat.
Heart Skips A Beat was a smash hit, and the first no. 1 off of Olly's second album, In Case You Didn't Know.
All Ed needed was his guitar, playing a brilliant rendition of his hit song Lego House.
She's back! After conquering the BRIT Awards last year, Adele returns with a barnstorming live performance of Rolling in the Deep.
The 23-year-old singer had to cancel a tour last year due vocal cord problems, but after surgery her voice is better than ever.
She was performing after collecting the British Female Solo Artist gong.
Bruno spiced up his hit single Just The Way You Are, changing the arrangement and somehow making a classic song even better.
Bruno was delighted to pick up the International Male Solo Artist earlier in the evening.
The song became the 108th million-selling single in the UK ever.
The song is taken from his album Doo Wops & Hooligans, the third biggest-selling album of 2011 in the UK.
Rihanna performed We Found Love, the lead single from her sixth studio album, Talk That Talk.
The Bajan beauty performed in front of a stylically paint splattered stage design.
The 24-year-old won the International Female Solo Artist award for the second consecutive year.
As ever, Rihanna was backed by her impressive stage dancers.
Talk That Talk sold an incredible 163,000 copies in the UK in its first week alone.
Blur ran through a medley of hits that including Song 2, Parklife and Girls And Boys.
Blur were one of the biggest British bands of the 1990s. Their last album, Think Tank, was released in 2003.
In the extended footage, Blur were joined by a gospel choir for a rousing rendition of their feelgood anthem Tender.
They were joined by Phil Daniels for an ecstatic version of their anthem Parklife.