LOS ANGELES (Reuters) - Canadian pop star Justin Bieber and country-pop darling Taylor Swift were among the early winners at the American Music Awards on Sunday, picking up accolades in the pop and country categories at a live televised awards ceremony. Bieber, 18, picked up the award for favorite pop/rock male artist, beating out stiff competition from Flo Rida, Pitbull and Usher. The star walked the red carpet with his mother, Pattie Mallette, after his widely reported split from former Disney star and girlfriend Selena Gomez. ...