Actress turned singer Holly Valance has a secret phobia - she's scared of flying, and caused a scene at a British airport before boarding a flight.

The Kiss Kiss hitmaker arrived at London's Heathrow airport to catch a flight over to Los Angeles - only to find boarding the plane more of a trauma than she'd expected.

A bystander says, "Holly is scared of flying and was not handling it well at all. She burst into tears and started screaming her head off. She was making a real scene."