Katy Perry Vs. Justin Bieber - YOU Decide!

Katy Perry is set to challenge Justin Bieber at the cosmetic counter - the pop star has announced plans for a new nail polish line.

The colourful California Gurls singer, who is famous for her ever-changing nail art, has teamed up with OPI - the same company behind Bieber's One Less Lonely Girl product.

The Baby singer's range of varnishes will be available through U.S. stores in time for the Christmas holidays. The Katy Perry for OPI collection will be available in January and will feature four different shades: Teenage Dream; Not Like The Movies; Last Friday Night, and The One That Got Away.

Perry turned heads at the MTV Video Music Awards in September by sporting a customised manicure featuring pictures of her husband-to-be Russell Brand.