Jessica attends the "Apt Pupil" Premiere on October 6, 1998 in a perfect-for-fall outfit, with dark colors from head to toe.
At the "Never Been Kissed" Premiere, we're not surprised to see Jessica in this classic late-'90s, early 2000s style.
Jessica wore this floral maxi dress to the 27th Annual People's Choice Awards.
Alba embraced winter whites for the Golden Globe Awards.
Casual and sheer was all Jessica needed for a great VH1 Big in 2002 Awards outfit.
Jessica wore this fitted halter to the Elton John AIDS Foundation's 11th Annual Oscar party.
Alba wore a white top and jeans to the 2003 ESPY Awards.
We love the pop of red on this strapless dress for the 4th Annual Latin GRAMMY Awards.
Jessica Alba in a Louis Verdad Dress during SKYY Vodka and Maxim Magazine Party.
Jessica chose a lime green ruched dress for the VH1 Divas Benefitting The Save The Music Foundation.
Jessica went for a summery vibe during The 2004 Teen Choice Awards.
Red and strapless is the perfect dress for the "Sin City" Premiere.
Jessica looked stunning during the 2005 Cannes Film Festival Premiere of "Sin City."
Jessica chose a dress embellished with pretty butterflies for the 2005 MTV Movie Awards.
Jessica Alba attended the "Into the Blue" Premiere in a tea-length strapless dress.
Jessica wore this champagne lace, open-backed dress to the Academy Awards, and was a show-stopper.
Jessica looked lovely in this silver strapless dress during the "Costume Institute Gala" at the Met.
One of our favorite combos: black and gold.
Alba wore this classic look to the 7th Annual El Sueno De Esperanza Gala.
Jessica was glowing in this feathered strapless gown at the 80th Annual Academy Awards.
Jessica debuted new bangs with this intricately-adorned black gown at the Keep A Child Alive Organization's 5th annual Black Ball.
Jessica attended the Film Independent's 2009 Independent Spirit Awards and looked positively lovely in this lavender dress with her bright floral clutch.
Feminine ruffles are always in style, and Jessica went for a classic look of black and white.
Continuing the black and white look, Jessica wore this dress with an interesting neckline to a book launch party.
We love the dress, but we are totally distracted by that bling!
Between Jessica's amazing hair cut, dress and platform heels, her outfit for the "Valentine's Day" Los Angeles premiere was a huge win.
If anyone can pull off this tight leather dress, it's Ms. Alba. She looked amazing!
Jessica attended the 2010 White House Correspondents Association Dinner in a gorgeous peplum gown.
Jessica chose a gold and black sequined dress for a screening of "Machete."
We can't get enough of Jessica's dress for the BAFTAs, and the perfect pop of red on her lips!
A pregnant Alba looked stunning for the CFDA Fashion Awards.
In a fun twist on a classic dress, Jessica sparkled at the Glamour Women of the Year Awards.
Jessica looked lovely at the Golden Globes in this lavender embellished gown.
Metallic was (and still is!) very in, and Jessica rocked this dress for the Costume Institute Gala.
We love a girl that makes bold fashion choices, and this dress is certainly one of those.
One of the most talked about -- and loved -- dresses from this year's Golden Globes, Alba hit it out of the park with this coral gown.
Sleek from head to toe, Jessica looked gorgeous in this ensemble for the opening of Tommy Hilfiger's L.A. Flagship store.
One of our "hits" of the night, Jessica looked gorgeous as always in this flirty pastel dress at this year's Kids Choice Awards.
Could she be any more flawless?
Alba attended the Baby2Baby Gala in what may be our favorite dress of 2013 - of all the dresses worn by anyone.
Always chic, Jessica killed it at the Christian Dior 2014 Autumn/Winter show at Paris Fashion Week.
We loved Jessica's crop top and high waisted skirt at this year's MTV Movie Awards.
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Alba and Warren met on the set of "Fantastic Four" back in 2004 and married four years later in 2008.
In recent years, Alba has shifted her focus from acting to growing her Honest Company, which she co-founded in 2011 in an effort to emphasize non-toxic household products. As of two years ago, the wildly successful company was valued at over $1.7 billion.
Though it's unclear how far along Alba is in her pregnancy, it's possible that she'll join the long list of celebrities that have welcomed children in 2017 already. On that growing list? George and Amal Clooney, Bradley Cooper and Irina Shayk and Hoda Kotb.
See all the 2017 celebrity baby births in the gallery below:b
Celebrity Baby Births of 2017
Celebrity Baby Births of 2017
Following one of the most buzzed-about pregnancies in years, George and Amal Clooney became first-time parents when they welcomed twins -- Ella and Alexander -- on June 6, 2017.
Molly Sims gave birth to little Grey Douglas in January 2017.
Hoda Kotb adopted her first child, a baby girl named Haley Joy. She was born on Valentine's Day 2017.
Model Irina Shayk and hunky Bradley Cooper had their first child in April 2017 -- and with those genes, she's sure to be a knockout!
Jimmy Kimmel's wife, Molly, gave birth to their second child on April 21 -- and just hours after his delivery, he was slated for open heart surgery. Kimmel opened up about the terrifying events, getting emotional on-air as he detailed his newborn's difficult journey. Thankfully, little Billy is now on track to a full recovery.
Ciara and husband Russell Wilson welcomed baby Sienna Princess on April 28 after months of public anticipation! Ciara documented the pregnancy heavily via social media up until the big day.
At 50 years old, Janet Jackson welcomed her very first child, a boy named Eissa Al Mana. She and her husband, Qatari business magnate Wissam Al Mana, split not long after.
He largely stays out of the spotlight, but reports confirmed that Jesse Eisenberg and girlfriend Anna Strout welcomed their first child in early 2017.
Benedict Cumberbatch and his wife, Sophie Hunter, grew their family by one with the birth of son Hal Auden on March 3. His big brother is Christopher, born in 2015.
Natalie Portman and her husband, choreographer Benjamin Millepied, had their second child on Feb. 22. Her name is Amalia Millipied.
Zooey Deschanel and her husband, Jacob Pechenik, had their second child in spring 2017, her rep confirmed. Little Charlie's older sister is Elsie, who was born in 2015.
Tori Spelling and Dean McDermott increased their already-full household with their fifty child, born on March 2. Little Beau is the perfect addition to "our big, beautiful and healthy family," Tori told People.
Gal Gadot gave birth to a Wonder Woman of her own in March 2017! She and her husband, Yaron Versano, were already parents to daughter Alma, born in 2011.
Backstreet Boys star AJ McLean and his wife Rochelle Deanna Karidis had the perfect name for a sure-to-be musically inclined baby: Their daughter, Lyric, was born in March.
Chad Michael Murray and Sarah Roemer excitedly announced the birth of their second child, a girl, in March 2017. Their first son was born in 2015.
"Grey's Anatomy" star Camilla Luddington and her boyfriend Matthew Alan announced the birth of their baby girl, Hayden, in spring 2017.
Pharrell Williams and Helen Lasichanh welcomed triplets (!!!) in January 2017. The little trio have an 8-year-old brother, Rocket. (By the way, this is the couple just a few months after Helen gave birth!)
Armie Hammer's wife, Elizabeth Chambers, gave birth to their second child in January 2017. The baby boy, Ford Douglas, has a big sister in 2-year-old Harper Grace.