Best Actress nominee Natalie Portman is hardly the first to dress for two on Oscar night.

But while the expectant 29-year-old has to be considered the odds-on favorite going into the event after her victory at the Golden Globes, her impending motherhood makes us wonder: Will being pregnant affect Portman's chances to win?

While we'd love to think that her gestational status is completely beside the point, maybe history can be a guide. Let's take a look back at the movie industry's big night to see how other pregnant nominees, such as Catherine Zeta-Jones and Cate Blanchett, have fared. Along the way, we'll learn who nearly gave birth right at the ceremony (or threatened to, at least).

Pregnant Actresses Who Won

1. Eva Marie Saint, 'On the Waterfront' (1954)
Category: Best Supporting Actress
Ceremony held: March 30, 1955
Clad in a very tasteful and all-covering satin jacket, Saint received her award from the previous year's Best Supporting Actor, Frank Sinatra. She joked, "I may have the baby right here." Saint was almost right: Her son, Darrell, was born just two days later.

2. Meryl Streep, 'Sophie's Choice' (1982)
Category: Best Actress
Ceremony held: April 11, 1983
Streep wasn't showing yet (and didn't mention her pregnancy in her acceptance speech) but chose a flowing, kaftan-like dress when she won for her amazing performance as concentration camp survivor Sophie. Her first daughter (and now actress) Mary Willa "Mamie" Gummer was born that August.

3. Catherine Zeta-Jones, 'Chicago' (2003)
Category: Best Supporting Actress
Ceremony held: March 23, 2003
Zeta-Jones not only won the Oscar while eight months pregnant, she performed 'All That Jazz' from 'Chicago,' live. Now that's show business! She gave birth to her first daughter, Carys Zeta Douglas, on April 20, 2003.

4. Rachel Weisz, 'The Constant Gardener' (2005)
Category: Best Supporting Actress
Ceremony held: March 5, 2006
Weisz stylishly waltzed to an Oscar win (over some rather tough competition, such as Michelle Williams in 'Brokeback Mountain') in a black Narciso Rodriguez dress. She had son Henry (with her then-boyfriend, director Darren Aronofsky) two-and-a-half months later, on May 31, 2006.

Pregnant Actresses Who Lost

1. Glenn Close, 'Fatal Attraction,' (1988)
Category: Best Actress
Ceremony held: April 11, 1988
On Oscar night, Close lost out to Cher, who was named Best Actress for 'Moonstruck.' Close's daughter, Annie Maude Starke, was born just two weeks later, on April 26, 1988.

2. Susan Sarandon, 'Thelma & Louise' (1991)
Category: Best Actress
Ceremony held: March 30 1992
While presenting for Best Film Editing, Sarandon and her then-beau, Tim Robbins, delivered an impromptu pro-Haiti speech that got them banned for the Oscars for a year. Five weeks later, they delivered son Miles, on May 4, 1992. The Best Actress winner that year? Jodie Foster, for the unstoppable 'The Silence of the Lambs.'

3. Annette Bening, 'American Beauty,' (2000)
Category: Best Actress
Ceremony held: March 26, 2000
Hilary Swank won the Oscar (for 'Boys Don't Cry') but Bening had a consolation prize: Daughter Ella (the fourth of her children with Warren Beatty) was born April 8, 2000.

4. Marcia Gay Harden, 'Mystic River' (2004)
Category: Best Supporting Actress
Ceremony held: February 29, 2004
The Oscar magic for 'Mystic River' (Sean Penn and Tim Robbins both won statuettes) didn't extend to Harden, who had won just a few years earlier for her supporting role in 'Pollock.' Her twins, Hudson Harden Scheel and Julitta Dee Harden Scheel, were born April 22, 2004.

5. Cate Blanchett, 'Elizabeth: The Golden Age' and 'I'm Not There' (2007)
Categories: Best Actress and Best Supporting Actress
Ceremony held: Feb. 24, 2008
Blanchett was a double nominee and a double loser at the 2008 Academy Awards, but the sting wasn't too bitter -- she'd won for 'The Aviator' in 2005. Plus, six weeks after the Oscars, her son Ignatius Martin was born, on April 13, 2008.

Check out the full list of 2011 Oscar nominees

CATEGORIES Features, Oscars, Awards