Appearing in a new Super Bowl commercial, Justin Bieber helps T-Mobile get the party started as the company’s resident Celebration Expert. Offering #UnlimitedMoves with a series of touchdown dances, Bieber receives help from an all-star cast. Rob Gronkowski channels his inner caveman while Terrell Owens transforms into a cheerleader. Meanwhile, Bieber remains suave in a Dior Homme tuxedo with stylish Saint Laurent boots. The singer also turns on the geek chic charm in a pair of oversized glasses.