R&B star Chris Brown has won four BET awards at a ceremony in Los Angeles.The 22-year-old, who released his fourth album in March, picked up prizes including the viewers' choice award, male R&B artist and video of the year.He shared the best collaboration prize with Busta Rhymes and Lil Wayne.The Black Entertainment Television (BET) awards recognise the achievements of African Americans and other minorities and have been held every year since 2001.After picking up his award Chris Brown said: "I know it's been a long road, so I just appreciate every blessing that's been in front of me."The singer performed an emotional tribute to Michael Jackson at last year's event.In 2009, Chris Brown was taken to court after assaulting then girlfriend Rihanna in Los Angeles.He was sentenced to five years probation and 180 days community work after pleading guilty to assaulting her the night before the 2009 Grammy awards.Elsewhere Tinie Tempah picked up the international act prize with Rihanna, Nicki Minaj and Kanye West winning female R&B artist, female hip hop artist and male hip hop artist.Other awards handed out at LA's Shrine Auditorium went to Wiz Khalifa (new artist) and Diddy Dirty Money (group) with Jaden and Willow Smith tying for the young stars award.British actor Idris Elba, from The Wire and Luther, picked up the acting prize.Source: BBC