"By the time she finished the first song, there must have been 50 little girls and their moms who came rushing up," said Ray Rogers, owner of StingRay's restaurant on Tybee Island. He caught Miley's surprise gig on video.

Rogers said the 16-year-old Hannah Montana star dined on snow crab legs with a friend after wrapping up Monday's first day of filming of the Walt Disney Co. movie.

Then she got up and asked a local acoustic duo playing music if she could sit in. Miley stepped up to the microphone and strapped on a guitar to sing the Tim McGraw and Faith Hill duet It's Your Love, then added a new song of her own.

"She played those and then we got her out of here," Rogers said. "We asked her, 'What do you wanna do?' and she said 'I want to get out of here.' So we walked her to a side entrance nobody knew about and got her in her car."

The Last Song will be filming on Tybee Island and in nearby Savannah until mid-August, stirring interest among locals and tourists alike. The movie features Cyrus as a teenage girl struggling with her parents' divorce who tries to reconnect with her father during a summer at his home in a quiet beach town.

The movie's publicist, Rachel Aberly, did not immediately return a phone call and e-mail message seeking comment Wednesday.