Mermaid Katy Perry blows us away

The singer dons a stunning, skin-tight mermaid outfit for her latest advertising campaign for GHD Air hairdryers.

The Firework star shows off her svelte curves in the strapless, multi-coloured outfit which comes complete with tail.

The 27-year-old is renowned for frequently changing her hair colour she's sported black, blonde, blue and now pink.

But something smells fishy to us.

Is Katy wearing a wig to advertise the hair care appliance?

The glamorous picture was taken by esteemed photographer David LaChapelle.

Katy talked about the shoot in a recent interview saying: "It was fun. I got to have purple hair which foreshadowed the real purple hair I had last fall."

The singer is gearing up for her first major performance since separating from comedian Russell at the Grammy Awards next weekend.

Bet she'll be flip-pin' fantastic.