06/20/2011 07:06 EDT | Updated 08/20/2011 05:12 EDT

Justin Bieber, Lady Gaga, Avril Lavigne and More: Big Photos Of The MuchMusic Video Awards 2011 (PHOTOS)

Lady Gaga won two awards and provided a double shot of her trademark edgy, eccentric stage theatrics at Sunday's MuchMusic Video Awards — but it was a surprise appearance from beloved teen-pop star Justin Bieber that really sent fans into a frenzy. Read more here.