Miley Cyrus ruined an emotional scene because she couldn't be away from her cell phone. The 17-year-old actress admits she was "embarrassed" when her most touching on-screen moment was interrupted by her cell ringing in the middle of filming.

"The funniest scene was also the saddest. Ronnie visits her terminally-ill dad in hospital and is struggling to hold back the tears. It was absolutely silent on set and suddenly my mobile phone goes off playing 'Don't Worry Be Happy'.

"I'm just so anxious about losing my phone I always have it with me. That was quite embarrassing, but also absolutely hilarious."

Despite the unprofessional disruption, Miley claims she's serious about an acting career.

I've always wanted to act, even though the critics don't seem to be very enthusiastic about my first serious role. I know I've done my best and that's the main thing."

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Photos by INF