Quick-Change Celebrities

RIHANNA

The always daring singer wowed in a wacky Victor & Rolf number and diamond earings by Georgina Chapman for Garrard at clive Davis' pre-Grammys bash. For the show itself, where RiRi accepted the Best Rap Collaboration trophy with Jay-Z, she went for a regal snow queen look in Elie Saab Haute Couture.

FERGIE

Before picking up the Best Pop Performance by a Duo or Group trophy for the hit "I Gotta Feeling," the Black Eyed Peas hottie rocked an electric-blu Emilio Pucci mini and a Kwiat diamond cuff., Later, she showed her fierce side in a sexy futuristic look to perform the group's award-winning song as well as their single "Imma Be."

PINK

The nominee arrived in Old Hollywood style in a Tony Ward gown and Neil Lane jewelry worth $2.5 million! she hit the stage later in a hooded gown that stripped off to reveal a barely there bodysuit while performing "Glitter in the Air"-complete with aerial acrobatics.

LADY GAGA

The "Poker Face" singer loves to push the fashion envelope - and the Grammys were the perfect place to do it! Arriving in a custom-made space-age gown by Giorgio Armani and glittering platform heels, the pop star, who picked up two Grammys, changed into a silvery Philip Treacy hat and a mini, also by Armani, to pose in the press room with her awards.

CARRIE UNDERWOOD

"I'm easing him into my world a little bit," joked the country crooner, who brought hockey pro fiance Mike Fisher. She glammed it  up in a stunning Edition by Georges Chakra gown and Ippolita Silver jewels before switching to a strapless golden number to sing in the Michael Jackson tribute.

BEYONCE KNOWLES

Before scooping up a whooping six Grammys, the singer worked the red carpet in a body-hugging Stephane Rolland gown. After performing in a sexy black leather Atelier Versace getup, Bee slipped into a dazzling mini by Armani Prive paired with giant diamond hoops by Lorraine Schwartz!