WATCH: Nicole Scherzinger sizzles in sexy bikini as she pays tribute to sister on her birthday

Nicole Scherzinger posted a video in honour of her sister's birthday where the siblings wear in sexy bikinis.

The singer took to Instagram to wish her sister Keala a happy birthday. To celebrate the occasion, Nicole posted a video of them having fun wearing sexy swimwear.

Nicole, 47, also took to her Instagram stories to post photos of the stunning siblings

As they carried on flaunting their figures in the slinky ensembles.