Following Usher's halftime show, Bieber posted to Instagram on Monday and congratulated the R&B superstar, 45, with whom he's collaborated on 2009's "First Dance" and 2010's "Somebody to Love ...

Follow the San Francisco native, Black Barbie collector and proud mom of two on Instagram and Twitter @janinerube This past Sunday, R&B superstar Usher set ... and do what I love to do after ...

Despite sitting this one out, Bieber and Usher share a long-standing friendship and a rich musical history, dating back to Bieber’s early career. Their collaboration on Somebody to Love remains ...