Reese Witherspoon wore a simple black-and-white strapless column dress, but it couldn't be classier or more chic and unusual for America's Sweetheart. The look is Tom Ford -- Reese and other A-listers attended, and WALKED in the famous designers pre-Oscar runway show.

Meanwhile, Sienna Miller wore Oscar de la Renta -- which is actually black and navy. The American Sniper star's dress was see-through lace on the bottom half of the skirt and the bodice featured velvet bows.

Lady Gaga and Jennifer Lopez obviously believe they should go big of go home!

And that, they did ... Gaga donned custom Alaia -- the designer's first-ever Oscars design. The singer will perform tonight and wear ... count 'em, no fewer than THREE custom pieces by Azzedine.

Gaga posed with an unlikely pal -- the more understated Keira Knightley, who wore an embroidered tulle and silk, high-waisted dress over her baby bump. The look is Valentino ... perfection!

The biggest surprise was Jennifer Lopez in a fuller-than-full Elie Saab gown covered in sequins, looking like a hot, Latina fairy princess!

Gwyneth Paltrow and Zoe Saldana opted for demure pink at the Academy Awards tonight -- with Gwyneth wearing an amazing, body-con column dress in pink silk with a gorgeous silk rose on her asymmetrical, one-sleeved dress, designed by Ralph & Russo Couture. Her hair is pulled back sleekly and she's wearing stunning ruby and diamond earrings.

Meanwhile, new mom Zoe Saldana showed off her amazing post-baby figure in a dusty rose piece with a wrapped look around the middle, sweetheart neckline and thin straps. Don't forget, she just gave birth to twins three months ago!

Some of this evenings hottest celebs chose white hot looks for the Academy Awards red carpet. Nominee Julianne Moore wore custom Chanel, while Marion Cotillard looked elegant in Christian Dior couture and Lupita Nyong'o donner custom Calvin Klein.

Moore, nominated for Best Actress for her part in Still Alice looked perfect, as always, in a strapless white piece designed by Karl Lagerfeld.

Marion's Dior gown has an interesting billow in the back -- almost like a 1920's flapper dress with a dropped waist, exaggerated and work backward! The actress is not only a presenter tonight, but is nominated for her lead role in Two Days, One Night.

Lupita's dress features more than 6000 pearls, hand-sewn on the bodice and skirt of the dress!!! She accessorized with Chopard diamond earrings and finished off the look with Nicholas Kirkwood shoes.

Which look do YOU like best?

It's always good to see celebrities using their star power for a worthy cause and that's exactly what Nicole Kidman and Katie Holmes did on Saturday as they attended the 3rd annual Gold Meets Golden luncheon at the Equinox Sports Club Lounge in West L.A.

The starlets, who were also joined by other notables and Oscar nominees like Maria Shriver, Eddie Redmayne and Laura Dern, were co-hosts for the benefit that will help fund the 7,000 athletes participating in the 2015 Special Olympics World Games.

"I am inspired to join with those who want to make a difference for the 7,000 Special Olympics athletes competing in the World Games this summer,” said Shriver, who's continuing the legacy of her mother Eunice Kennedy Shriver, in a statement. “I want to thank Gold Meets Golden for helping build the awareness that leads to acceptance and inclusion for all people with intellectual disabilities.”

This will mark Kidman's second time co-hosting the event since its inception in 2013. Past hosts of the Gold Meets Golden luncheon include Keith Urban, Jon Bon Jovi, Kerry Washington, Sofia Vergara and Hayden Panettiere.

She knows how to work her wardrobe!

Miley Cyrus once again showed that she and her style choices aren't the least bit bashful as she donned a sexy black lace gown at the Tom Ford party in Hollywood last night.

Boyfriend Patrick Schwarzenegger, who kept things traditional with his 'fit, was also on hand for the pre-Oscar fashion show at Milk Studios. Virtually every star managed to make their way to the event if only for a moment (even J.Lo!) but the former Disney star had the most interesting outfit by far.

We're sure Patrick is probably loving it!

Courtesy of Twentieth Century Fox/Atsushi Nishijima
While some stars were partying it up on Oscars eve, others opted for a more celebratory gathering at this year's Independent Spirit Awards!

The final award show before the big one honored some of the year's top films, with Birdman coming away with many of the more prestigious awards for the night including Best Picture and Best Actor (Michael Keaton). Boyhood was hot on its heels as it took Best Director and Best Supporting Female (Patricia Arquette) in what some say could be a solid indicator of what to expect at the highly anticipated 87th Academy Awards.

Stars like Scarlett Johansson, Olivia Munn and Kerry Washington were on hand to celebrate with their peers and take in the festivities for the night. See the complete list of winners as well as who else attended the award show!

Los Angeles was teeming with a bevy of events leading up to Hollywood's huge day, with one of them being the William Morris Endeavor Pre-Oscar Party where virtually every star showed up!

Attendees such as Gigi Hadid stunned in a pink and red Versace dress with a scintillating side split that most likely garnered a lot of attention while some of the men like Wiz Khalifa, Mark Wahlberg and Tobey Maguire kept it super casual with jeans and sneakers.

Jim Carrey, Steve Carrell and Leonardo DiCaprio were also on hand as many of Hollywood's most recognizable faces came to the annual shindig hosted by one of the entertainment industry's biggest agencies.

Click through our gallery to see who else made a cameo at one of the most prestigious pre-Oscar parties in L.A.!