Jennifer Hudson conjured up good luck by wearing Oscar de la Renta on the carpet: she later left the theater with a Best Supporting Actress Oscar for Dreamgirls.

She may have lost the Best Actress trophy to Helen Mirren, but hey, losing to a legend isn't the worst thing -- especially when you look stunning in a pale green Valentino.

Isla Fisher shined in an emerald Monique Lhuillier without her then-fiancé Sacha Baron Cohen, who was probably off pranking someone.

The devil wears Prada, but the sweet star of that film -- and future winner of the Best Supporting Actress trophy for her turn in Les Misérables -- went for Valentino.

The Spider-Man star got us all caught up in her tulle-embroidered Chanel Haute Couture Collection piece.

The Little Miss Sunshine ray of light wore a cute Simin pink dress -- which seems perfectly roomy and comfortable for the then 10-year-old who, just a guess, would've been comfortable in jeans and Chuck Taylors.

It would be many more years before she would achieve global domination status, but even in 2007 the Dreamgirls star - in Armani Prive -- was giving a master class on how to be flawless.

Justin Timberlake's future baby momma looked cool in Oscar de la Renta.

Who better to present the award for Best Animated Feature Film (which went to Happy Feet) than the perennially upbeat Diaz... who's surely looking back at this ensemble with lovable self-deprecation?

The Best Supporting Actress for Notes on a Scandal lost to Jennifer Hudson but still stunned in Giorgio Armani Prive.

Her ruched Givenchy and dark hair looked a little more goth than glam, to be honest.

Always somehow rebellious and appropriate at the same time, the Best Actress winner (for The Queen) let her rock 'n' roll attitude shine in Christian Lacroix.

Nicole Kidman, who presented alongside Daniel Craig for Best Art Direction, was red hot in a dynamite Balenciaga.

Long before she'd rather be at home boycotting the Oscars with some Netflix and Chinese takeout (we're assuming), Jada rocked a Carolina Herrera gown and hit the red carpet to support her son Jaden Smith, who starred in the Oscar-nominated The Pursuit of Happyness, and hubby Will Smith.

Red carpet slayer Jennifer Lopez, who introduced Beyonce and Jennifer Hudson's musical performance, gave goddess vibes in Marchesa.

Volver's leading lady wowed in an Atelier Versace number featuring a bustier made of silk chiffon.

Her more famous co-stars might've overshadowed the third Dreamgirls star, but she still got some shine that night, literally. On her feet are Stuart Weitzman's silver "Dream" stilettos, which were adorned with 30 carats' worth of Kwiat diamonds. They're valued at $500,000!

The presenter of 2007's In Memoriam tribute looked like a floating cloud in Vera Wang.

The then-new mom seemed to still be glowing in her Proenza Schouler, a timeless look that still managed to be current thanks to the one-shoulder style that was apparently trending that night.

Wearing Prada on the night you're nominated for The Devil Wears Prada might've been derided as obvious on anyone else, but for Meryl, her choice was cheeky, ironic and from the looks of it, comfy and low maintenance too.

King Kong's bae was the perfect choice to present the Best Visual Effects award that year, and her canary frock was something to go ape over.

Champagne anyone? Rachel Weisz looked like she was totally ready to pop bottles in her satin Vera Wang the color of bubbly.