Miley Cyrus and John Travolta could be recording a duet

Miley Cyrus could be set to record a duet with John Travolta, the Grease star's wife, Kelly Preston, has revealed.

"Johnny may sing with Miley," Preston said at yesterday’s Step Up Women’s Network’s Inspiration Awards luncheon at the Beverly Wilshire Hotel.

Travolta, and Miley, 15, are both voicing characters in the upcoming animated flick Bolt. He and Kelly first met the Hannah Montana star when she was opening for Cheetah Girls during their concert tour about two years ago. "We [now] know Miley very well,” Preston tells E!, "and she’s a sweetheart."

Preston also says she hasn't seen the teen sensation's Vanity Fair shoot. "All I know is that I know her personally and she’s a really good girl with a great head on her shoulders," she said.