January Jones shares nude pregnancy throwback as stars celebrate ‘Bump Day’: pics!

A bumpin’ throwback! January Jones shared a rare flashback photo of herself on Wednesday. Not only was she honoring her son Xander’s 6th birthday, but the 39-year-old actress also happened to post the nude pregnancy pic on Bump Day.

“Happy day of birth to my son, my whole heart,” she captioned the underwater photo of herself. 

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Celebrity nude shots in 2017
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Celebrity nude shots in 2017
comfortable in my rolls. fuck wit me.
Happy day of birth to my son, my whole heart ❤️
So honored to have been photographed by Mert and Marcus for their book new book! 20 years in the making! It's out Sept 7th #mertandmarcus @mertalas @macpiggott #taschen
Cheers to @playboy for going back to nudes. The female body is so beautiful, every size and every age. Be proud! #thefemalebodyisbeautiful #allshapesandsizes #loveyourself #loveyourbody
Hot dog dog. Thanks for chiming in on what you feel I deserve to be paid. I believe women deserve equal pay. However I don't believe I deserve equal pay to Chris and Dave. They are legends and 2 of the greatest comics of all time. I would like to say that I have been selling out arenas these last couple years. Something a female comic has never done. That's a big deal to me, especially because I know I do my best every night on stage for the audience and they have a good time. I didn't ask for the same as my friends. I did ask for more than the initial offer. I will continue to work my ass off and be the best performer I can be. The reports of me "demanding" or "insisting" on equal pay to them aren't a true. #fat #stealsjokes
#54 and clean. Thanks for the birthday wishes!
tock
🌺🌸🌹🌸🌺🌹
i don't smoke
Another day at the office 😛♥️
in Eutopia 🌬🦋💙
Mikey made me do it ... Miami nights 🙌🏻 1. This is my pre DWTS body🦄 2. I am not currently in Miami but am in NYC 3. I posted this knowing most of you would be judgmental and couldn't resist a chance to tear me down and I was right. 4. Go be offended at your own life. 5. I'm living my life to the fullest. ❤️
Just wanted to share that one of the reasons @eatingboys has inspired me so much is because of the way she mixes her humor and sexuality. I spent so many years loving my body but thinking it wasn't lovable by others- its sole purpose was to be fodder for jokes. I performed the insult so no one else could. I don't regret any of it- that's my art and that was my truth- but now, at age 31, having been through hell and back with my health and other people's perceptions of my physicality, I feel deeply comfortable with the idea that this pear-shaped pot of honey is equally good for making people laugh and laying out like a Suicide Girl circa 2004. Love it all.
mother nature
Amore mio
I’ll tell you what freedom is to me. No fear. #NinaSimone
Gold 💛
Something special today 🖤
playing dress up
birthday suit
La Sirena
Mid fitting nap time 😈
I'm very proud to be a part of the March/April issue of Playboy. I penned a short essay along with my pictorial titled, "The Feminist Mystique". A big thank you to @Playboy, the creative team, and @cooperbhefner for such a unique opportunity. #NakedIsNormal
NYC//bed series
Loving you so far 2017. ✌🏻
Thank you @fsseychelles for your outdoor showers, beautiful hospitality, delicious steaks and flying foxes! Shot by my exclusive shower partner @mrjustinervin💦
Nap time = The Best Time 😇🙌🙌
The mystery about my panties... solved! 😂🤣👏🏻. Can u see 🤓 me now?! Lol . The jokes on u🙃🥂 #opticalillusion
🛀🏾🍷🎁 That's what's up #NewSong #NewVideoAlert #BirthdaySong! 🚨🚨 👉🏽#gratitude! Feeling so grateful today! #LinkInBio
Just a typical press day with @mj_day for the launch of @si_swimsuit 2017!!
Simplicity
Angela
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In the image, the naked star is covering her chest and swimming in the pool of water.

Many other celebrities also took to Instagram to share their baby bump photos in honor of the day of healthy pregnancy awareness.  

Amanda Seyfried shared a shot of herself in a one-piece swimsuit on the beach, writing, “Happy #bumpday! Flashback to my 27 week bump. ‘It's hard to believe and it's heartbreaking: Every single day around the world, 830 women die from pregnancy, childbirth or related complications. Every mom deserves a safe, healthy pregnancy, and every baby deserves a fair shot at life. By donating to the What to Expect Healthy Birth Project of the International Medical Corps this #BumpDay, you can help make that happen.’”

Sienna Miller so shared a throwback, writing, “The goal of ending preventable child and maternal deaths is within reach. Here's me and my Marley bump to celebrate! #bumpday @internationalmedicalcorps #raiseawareness.” 

MORE: Jessica Alba Stylishly Shows Off Baby Bump at NYFW Shows -- See the Pics!

And Savannah Guthrie posted a photo of herself during her pregnancy, posing with her own mother. 

“On this #bumpday thinking of the mama who carried me - and the privilege of carrying my babies. Support healthy moms and pregnancies!” she wrote.

RELATED: Celebrity babies we've welcomed in 2017:

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Celebrity Baby Births of 2017
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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.
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