In which year did Justin Bieber have his first number one single on the US "Billboard" Hot 100?

I'm a beliber! that is a fan of Justin beiber! I love his music! he is a very talented young man!! and he seems cool and down to earth! would like to meet him someday!! for sure!

did y'all know that tyla! the beautiful south African singer! like her music love her personality big fan! but she said her celeb crushes was Justin beiber! and morris chestnut I was like eh!( Justin is aight! morris ehh! whatever! I already have a celeb crush and it's Michael Jackson the king of pop!) but that's what she said!