AGE 15
MILEY CYRUS
VALENTINO
"It's from Valentino's last collection, so it's really cool to have this last piece of art," said Cyrus, who accessorized with a Mary Norton clutch and Neil Lane jewels.

AGE 29
KATHERINE HEIGL
ESCADA
"We wanted to go for a Roman-retro look," said Chanel makeup artist Monika Blunder of the star, who completed her look with diamonds and a Jimmy Choo bag.

AGE 34
HEIDI KLUM
HAUTE COUTURE BY JOHN GALLIANO
"I feel like a princess," said Klum of the gown, which is being donated to Diet Coke's Red Dress Sweepstakes. Her bling is from her own collection for Mouawad.

AGE 62
HELEN MIRREN
GEORGES CHAKRA
"I wanted a warm but dramatic dress," said the star, who opted for Swarovski-studded sleeves and diamonds from H. Stern and Fred Leighton.

AGE 85
RUBY DEE
KEVAN HALL
"I feel great—and I feel warm!" laughed the Supporting Actress nominee, who combated 50° weather with a jacketed dress (and Jeffrey Rackover jewelry).

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How They Accessorized
TEENS: EARRINGS Cyrus added "big and bright" chandelier earrings by Neil Lane.

20s: RED LIPS "We emphasized the lips to pop with the [color of the] dress," said Blunder.

30s: MATCHING GLITZ Klum carried a LIEBER Swarovski crystal minaudière and wore gems "designed to go with the dress."

60s PLUS: PLATFORMS "Usually I wear my stripper shoes, so these are quite low," joked Mirren.