Justin Bieber makes Australian girls swoon in his official video for the 'Believe Acoustic' version of 'As Long as You Love Me.'

In the final song of his set Down Under, Biebs winks at and charms the crowd. And surprisingly, there are some boy Beliebers here -- check out the couple dancing along at 1:14. It's just Bieber and a guitar, and he delivers, including his own rendition of Big Sean's verse as well as a shout out to Australia ad libbed near the end. You can snag it on Jan. 29 when 'Believe Acoustic' hits shelves, though much of it has leaked already!