Christina Aguilera is used to applause. A performer since childhood, Aguilera has sold nearly 50 million albums worldwide and won four Grammys -- one for each of her three studio albums and a group performance prize for her participation in the hit 'Lady Marmalade.'

Of late, however, Aguilera has been the subject of some rather vicious criticism. Her fourth album, 'Bionic,' hits stores today, and the record and Aguilera's promotion of it have put the 29-year-old singer in the media cross-hairs. It seems she can't do much of anything right; early reviews for 'Bionic' have been mostly tepid, her first single tanked and she can't even get dressed without being accused of ripping off other artists -- Lady Gaga and Madonna, in particular.