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Justin Bieber's canceled show in Portugal marks a HUGE change in his career. Ticket sales slipped for at least one show -- so, is the Biebs on a downhill slide ... or is there a different explanation? Plus, Justin Timberlake needs a lesson in dishing out revenge -- because his attempted Kanye West diss on 'SNL' was the weakest part of his 5th hosting gig. Also, how Tiger Woods got his groove back -- on the golf course, and on his yacht ... with Lindsey Vonn!