Panettiere trades her cheerleading outfit for a two-piece on the set of Heroes. Plus: Britney Spears, Geri Halliwell and more

ON THE FLY

Gwen Stefani continues her Sweet Escape Down Under! The pop star, who is currently touring in Australia, arrives at the Sydney airport with husband Gavin Rossdale (not pictured) and son Kingston, 14 months, on Sunday.