From the waist up, Justin Bieber and Kristen Stewart don't look too bad.
But scroll down to see JBiebs' totally dated and silly parachute pants -- who does he think he is? MC Hammer? KStew is such a gorgeous girl, but she had to ruin her outfit with sneakers (which frankly look better on Justin Bieber).
Also, be sure to check out designer Derek Fabulous ... or should we say Drabulous? What is up with that crazy turban, shorts suit and striped sandals? For more of the worst-dressed stars of the week, including "Real Housewives" star Teresa Giudice, click below!