Avril Lavigne perfects "Pink Bikini" Butt & Ass on a St Tropez yacht

The 26-year-old star was clearly enjoying herself with her friends, and there was no sign of boyfriend Brody Jenner, stepbrother to Kim, Khoe and Kourtney Kardashian.

At one point the star leapt off the yacht into the water, before dancing around the boat clutching a drink.

However, she did manage to suffer a couple of wardrobe malfunctions, with her bikini bottoms slipping down as she hauled herself out of the sea.

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Slip ups, The Canadian singer suffered a couple of wardrobe malfunctions on the yacht

Front crawl, Avril gets out of the sea back onto the boat, to continue the party

Fun times, Wearing a white sarong around her hips, Avril danced in front of one of her friends in the sunshine (Read more and See more Pictures)