Jessica Simpson posts cheeky bikini photo ahead of 40th birthday: 'Final days in my 30s'

Jessica Simpson is embracing the end of her 30s! The 39-year-old fashion designer took to Instagram to share a bootylicious bikini photo of herself wearing a brown and white cow skin-printed two-piece from her own collection, a black lace coverup, and a black cowboy hat with gold embellishments. 

"YEE-HAW to my final days in my 30’s 😜," she captioned the shot. 

The mother of three officially turns 40 on July 10. She's been hard at work staying fit amid quarantine. 

Last month a source close to Simpson told ET, "She is walking outdoors and on her treadmill. It’s the way she stays sane, so it’s as much for mental health as it is for physical wellness."

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NEW YORK, NY - APRIL 19: Jessica Simpson is seen on April 19, 2017 in New York City. (Photo by NCP/Star Max/GC Images)
NEW YORK, NY - APRIL 19: Jessica Simpson and Eric Johnson are seen going to dinner in the East Village on April 19, 2017 in New York City. (Photo by Gotham/GC Images)
NEW YORK, NY - APRIL 19: Jessica Simpson and Eric Johnson are seen on April 19, 2017 in New York City. (Photo by NCP/Star Max/GC Images)
LOS ANGELES, CA - APRIL 18: Jessica Simpson is seen at LAX on April 18, 2017 in Los Angeles, California. (Photo by starzfly/Bauer-Griffin/GC Images)
LOS ANGELES, CA - APRIL 18: Jessica Simpson is seen at LAX on April 18, 2017 in Los Angeles, California. (Photo by starzfly/Bauer-Griffin/GC Images)
LOS ANGELES, CA - APRIL 18: Actress Jessica Simpson is seen on April 18, 2017 in Los Angeles, California. (Photo by SMXRF/Star Max/GC Images)
NEW YORK, NY - OCTOBER 26: Jessica Simpson is seen at JFK on October 26, 2016 in New York City. (Photo by starzfly/Bauer-Griffin/GC Images)
NEW YORK, NY - OCTOBER 25: Jessica Simpson is seen on October 25, 2016 in New York City. (Photo by XPX/Star Max/GC Images)
NEW YORK, NY - OCTOBER 25: Jessica Simpson attends the 2016 FFANY Shoes On Sale Gala Fundraiser hosted by QVC at The Waldorf Astoria on October 25, 2016 in New York City. (Photo by Daniel Zuchnik/WireImage)
NEW YORK, NY - SEPTEMBER 21: Eric Johnson (L) and fashion designer Jessica Simpson leave their Noho hotel on September 21, 2016 in New York City. (Photo by Ray Tamarra/GC Images)
NEW YORK, NY - SEPTEMBER 21: Jessica Simpson and Eric Johnson are seen at La Guardia Airport on September 21, 2016 in New York City. (Photo by Raymond Hall/GC Images)
THE TONIGHT SHOW STARRING JIMMY FALLON -- Episode 0324 -- Pictured: (l-r) Jessica Simpson during an interview with host Jimmy Fallon on September 8, 2015 -- (Photo by: Douglas Gorenstein/NBC/NBCU Photo Bank via Getty Images)
NEW YORK, NY - SEPTEMBER 10: Jessica Simpson attends Jessica Simpson and Mike Gansmoe ring the New York Stock Exchange Opening Bell at New York Stock Exchange on September 10, 2015 in New York City. (Photo by Andrew Toth/Getty Images)
NEW YORK, NY - SEPTEMBER 10: Singer/fashion designer Jessica Simpson poses for photographs after ringing the New York Stock Exchange opening bell at the New York Stock Exchange on September 10, 2015 in New York City. (Photo by Brent N. Clarke/WireImage)
NEW YORK - SEPTEMBER 09: Jessica Simpson and Eric Johnson are seen out in Manhattan on September 09, 2015 in New York, New York. (Photo by Josiah Kamau/BuzzFoto via Getty Images)
NEW YORK, NY - SEPTEMBER 09: Jessica Simpson attends Jessica Simpson Collection Presentation Spring 2016 New York Fashion Week on September 9, 2015 in New York City. (Photo by Desiree Navarro/WireImage)
NEW YORK - SEPTEMBER 09: Jessica Simpson and Eric Johnson are seen out in Manhattan on September 09, 2015 in New York, New York. (Photo by Josiah Kamau/BuzzFoto via Getty Images)
NEW YORK, NY - SEPTEMBER 08: Jessica Simpson Visits 'The Tonight Show Starring Jimmy Fallon' at Rockefeller Center on September 8, 2015 in New York City. (Photo by Theo Wargo/NBC/Getty Images for 'The Tonight Show Starring Jimmy Fallon')
NEW YORK, NY - SEPTEMBER 09: Eric Johnson and Jessica Simpson attend Jessica Simpson Collection - Presentation - Spring 2016 New York Fashion Week at Tavern on the Green on September 9, 2015 in New York City. (Photo by Taylor Hill/FilmMagic)
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And when it comes to diet, it's all about moderation for Simpson. "There has definitely been a lot of baking going on with the kids and she doesn’t totally deny herself," the source added, noting that portion control is important for the mother of three. 

For more on how Simpson's staying healthy and fit following the birth of her daughter Birdie in 2019, watch the clip below: 

 

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