The Canadian popstar put on a blistering performance at the O2 Arena and picked up the prize for 'Best International Male Solo Artist' so no wonder he was in a mood to celebrate!
Biebs hosted an official after party at Tape London, attended by stars including Ella Eyre, Ellie Goulding, Lorde, Conor Maynard, Karlie Kloss, Jourdan Dunn and Olly Murs.
He was snapped arriving in a red beanie hat and white tee, before leaving in the same hat but a black tee. Spill something on yourself JB?! Justin later headed over to the rock 'n' roll Crobar in Soho, where he partied for around an hour.
Justin got a massive cheer from the crowd when he picked up his prize at last night's BRIT Awards, and he admitted it meant a lot to him after a difficult few years.
"Wow. This just shows life is a journey and everybody has their own journey, everyone has their ups and downs. I just want to take this moment to thank all my fans, everyone in the audience tonight," he said.
"Man, I'm shaking a little bit right now. I'm really appreciative, that's all. And you guys are awesome."
Earlier in the night, he was joined by James Bay for a gorgeous acoustic rendition of 'Love Yourself', before launching in to club medley 'Sorry'. Loved it!