Two very different Mel B's emerged from the Mayfair Hotel in London yesterday - her usual brunette self and a brassy blonde version.

The former Spice Girl stepped out in a cheap-looking platinum wig and a white mini-dress to attend the launch of the new XXX-triple berry flavour of Glaceau Vitamin Water.

(Splash News)

She was described as being dressed in "drag" by some unforgiving onlookers, but we're going to call her look "glacial."

(WENN.com)

Mel later ditched the wig and changed into a long satin black gown to attend the London premiere of Michael Jackson 'This Is It', where she was the most famous person to walk the red carpet at the bargain-basement event.

(WENN.com)

By contrast, the stars were out in force for the Los Angeles equivalent.

Better blonde or brunette?