Pamela Anderson performs on stage during the opening ceremony of the 17th Life Ball in Vienna. Oops! Has she's forgotten her pants! (AFP/Joe Klamar)

Mariah Carey is wheeled across the stage in a pink number as she kicks off the North American leg of her 'Charmbracelet Tour' during a show at The Colosseum at Caesars Palace in Las Vegas. (REUTERS/Ethan Miller)

British pop star Geri Halliwell performs in a pink leotard contrasted with a black bottom on stage at the finale to the annual 'Party in the Park' in London. (Getty Image/Dave Hogan)

Katie Holmes looks gorgeous in this well-cut black number. This chic babe knows how to hog the limelight! (AP/Michael Bec)

Showing off her shapely legs in a pale attire is Lady GaGa, creating her own style statement at the Monte Carlo Grimaldi Forum in Monaco. (REUTERS/Eric Gaillard)