Singer Rihanna has described how she is feeling under pressure to throw an amazing hen do for celeb pal Katy Perry.

Speaking to Access Hollywood, the star told of how Perry put her in charge of the celebrations and now planning the party is taking up more time than her current tour.

Describing the impending nuptials she said: "Her wedding is probably going to be the best wedding I've ever been to and now I have to match the bachelorette party to that."

It is unknown when the I Kissed A Girl singer will wed her fiance, comedian Russell Brand, but it's rumoured the ceremony will take place in India at the end of the year.

However, in the meantime Rihanna anticipates the bachelorette party will be a wild affair thanks to the bride-to-be's fun personality.

The Barbados-born songstress used to date hip-hop star Chris Brown until he was arrested following a domestic dispute hours before the pair were to perform at the Grammys in 2009.