Italian entrepreneur Gianluca Vacchi posted the video on Saturday with the caption, "Dancing on the table for girls." Scroll down for the details on "Extra's" "Wiggle" challenge!
Another video shows Efron and friends – including actress Michelle Rodriguez – hanging out on a dock. Zac sits shirtless, while Michelle does an upside down yoga pose in a bikini.
Jason Derulo and "Extra" want you to take the #ExtraWiggleChallenge. Post a video to Instagram of yourself doing the Wiggle. Tag it #ExtraWiggleChallenge @ExtraTV for a chance to win a NYNE TT portable Bluetooth speaker.