Are Justin and Miley collaborating?

Since they're two of the biggest superstars on the planet, so many fans would love it if Miley Cyrus and Justin Bieber joined forces. So when Miley was asked if she'd duet with the Biebs, she didn't hesitate before saying yes! "I have collaborated with him," she explains. "I don't know if we're ever going to let the world hear it, but there's a 100% chance that I'll do it, because I already did it." Release it, Miley- pretty please?!