How sheer is too sheer?

Fergie must have been in the mood to flash her fabulous figure, because the sexy singer donned an orange lace Jean Paul Gaultier Haute Couture gown that perfectly showed off her black underwear while walking the red carpet at the Grammy Awards, on Sunday night.

The Black Eyed Peas frontwoman brought her mom as her date to the awards show, so lets hope she has a good sense of humor!

But where was her hottie hubby Josh Duhamel -- trouble in paradise?