Just when we thought things couldn't get any worse over on The Real Housewives of Beverly Hills.
But that wasn't the case!
Justin took the stage with some of his hits, including Baby, as well as some tracks off his latest album, Believe!!
Check out JB (above) with his acoustic serenade of Fall!
Aww… wonder if he was singing it to Selenita!
Bieber also got the crowd pumped up with his fancy footwork, when he took on All Around The World!