Justin Bieber: Shirtless & Underwear-Clad in Miami!

Justin Bieber shows off his underwear-clad body while stepping outside on Monday afternoon (January 28) in Miami, Fla. Later in the day, the 18-year-old singer put on some clothes and got playful with photographers by lifting up his shirt and flashing his abs. The night before, Justin wrapped up the first leg of his Believe