Hit or Miss!

Newly brunette bombshell Rihanna offset her darker hair with a vivid blue hue, wearing turquoise harem pants and a matching feathered halter to the launch of her fragrance, Reb'l Fleur, in London.

ANNE HATHAWAY

After rapping on Conan, the One Day star makes a more formal turn in a black-and-white, tuxedo-inspired ensemble for an appearance on the Late Show in N.Y.C.