Hayden Panettiere is not usually one for acts of indecent exposure in public, but yesterday the actress flashed her thong to a crowd of photographers.

The Heroes star was left red-faced after her g-string became exposed during a piggy back ride with her co-star.

And Hayden was none the wiser while her pink underwear was on full display during filming on the Heroes set.

We hope she isn't too mortified by this picture.

See other celebrity flashers below