This will be the third child for the “Gimme More” singer, who shares two sons – 16-year-old Sean Preston Federline and 15-year-old Jayden James Federline – with ex-husband Kevin Federline.
“I lost so much weight to go on my Maui trip only to gain it back,” she explained in her post, alongside a photo of pink flowers and a cup of coffee.
“I thought ‘Geez … what happened to my stomach ???’ My husband said ‘No you’re food pregnant silly !!!’”
Spears’ phrasing in the post raised eyebrows, however, because her longtime beau Sam Asghari has, to date, only been referenced as her fiancé.
In addition to opening up about her mental health during a previous pregnancy, 40-year-old Spears also noted in her post that she has no intentions of appearing frequently in public while pregnant because she wants to avoid the paparazzo while out, USA Today reported.
“This time I will be doing yoga 🧘♀️ every day !!! Spreading lots of joy and love,” she concluded the post.
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Photos: Britney Spears through the years Here are some memorable moments from pop star Britney Spears' life in the public eye. (Jordan Strauss/Invision/AP)
Photos: Britney Spears through the years 1998: Britney Spears at the 1998 American Music Awards. (Jeff Kravitz/FilmMagic)
Photos: Britney Spears through the years 1999: Teen pop sensation Britney Spears performing at Universal Ampitheater for her "Baby One More Time" tour in Universal City, California, on July 31, 1999. (Brenda Chase/Online USA, Inc. via Getty Images)
Photos: Britney Spears through the years 2000: Perfromer Britney Spears, winner of the awards for "Albums of the Year" and "Biggest One Week Sales of an Album by a Female Artist," arrives at the 2000 Billboard Music Awards on December 5, 2000, at the MGM Grand Hotel in Las Vegas. (Chris Weeks/Liaison via Getty Images)
Photos: Britney Spears through the years 2001: Britney Spears and Justin Timberlake of N'Sync at the Shrine Auditorium in Los Angeles. (Jeffrey Mayer/WireImage)
Photos: Britney Spears through the years 2001: Britney Spears onstage performing at the 2001 MTV Video Music Awards held at the Metropolitan Opera House at Lincoln Center in New York City on September 6, 2001. (Scott Gries/ImageDirect via Getty Images)
Photos: Britney Spears through the years 2002: Britney Spears and boyfriend Justin Timberlake arrive at the premiere of her movie "Crossroads" at the Mann Chinese Theatre in Hollywood, California, on Feb. 11, 2002. (Kevin Winter/Getty Images)
Photos: Britney Spears through the years 2003: Singers Britney Spears (left), Madonna and Christina Aguilera perform onstage during the 2003 MTV Video Music Awards at Radio City Music Hall on August 28, 2003, in New York City. (Scott Gries/Getty Images)
Photos: Britney Spears through the years 2004: Singer Britney Spears and husband Kevin Federline arrive at the 2004 Billboard Music Awards on December 8, 2004, at the MGM Grand Garden Arena, in Las Vegas. (Frazer Harrison/Getty Images)
Photos: Britney Spears through the years 2005: Musicians Britney Spears and Kevin Federline arrive at the 2006 Grammy Nominees party with Kanye West, hosted by Verizon Wireless and Rolling Stone Magazine, at the Avalon Hollywood on February 6, 2005, in Hollywood, California. (Matthew Simmons/Getty Images for Rolling Stone)
Photos: Britney Spears through the years 2006: Singer Britney Spears and husband Kevin Federline arrive at the Sony BMG Grammy Party held at the Hollywood Roosevelt Hotel on February 8, 2006, in Hollywood, California. (Vince Bucci/Getty Images)
Photos: Britney Spears through the years 2007: Singer Britney Spears performs on stage during the 2007 MTV Video Music Awards held at The Palms Hotel and Casino on September 9, 2007, in Las Vegas. (Kevin Winter/Getty Images)
Photos: Britney Spears through the years 2008: Singer Britney Spears performs during the Bambi Awards 2008 Show on November 27, 2008, in Offenburg, Germany. (Andreas Rentz/Getty Images)
Photos: Britney Spears through the years 2009: Singer Britney Spears arrives at the 2009 Teen Choice Awards held at Gibson Amphitheatre on August 9, 2009, in Universal City, California. (Jason Merritt/Getty Images)
Photos: Britney Spears through the years 2010: Singer Britney Spears and Jason Trawick arrive at the 52nd annual Grammy Awards held at Staples Center on January 31, 2010, in Los Angeles. (Christopher Polk/Getty Images)
Photos: Britney Spears through the years 2011: Singers Britney Spears and Rihanna perform onstage during the 2011 Billboard Music Awards at the MGM Grand Garden Arena on May 22, 2011, in Las Vegas. (Ethan Miller/Getty Images for ABC)
Photos: Britney Spears through the years 2012: TV personality Kim Kardashian, honoree Sir Richard Branson and singer Britney Spears attend Clive Davis and the Recording Academy's 2012 Pre-Grammy Gala and Salute to Industry Icons Honoring Richard Branson held at the Beverly Hilton Hotel on February 11, 2012, in Beverly Hills, California. (Larry Busacca/Getty Images For The Recording Academy)
Photos: Britney Spears through the years 2013: In this handout photo provided by the LA Dodgers, Britney Spears poses with sons Jayden James Federline (left) and Sean Preston Federline during a game against the San Diego Padres at Dodger Stadium on April 17, 2013, in Los Angeles. (Jon SooHoo/LA Dodgers via Getty Images)
Photos: Britney Spears through the years 2014: Singer Britney Spears (right) and cast members from the "Jubilee" show attend a "Britney Day" event at The LINQ Promenade held to celebrate Spears' Las Vegas residency show "Britney: Piece of Me" on November 5, 2014, in Las Vegas. (Ethan Miller/Getty Images)
Photos: Britney Spears through the years 2015: Musician Iggy Azalea and musician Britney Spears attend the 2015 Billboard Music Awards at MGM Grand Garden Arena on May 17, 2015, in Las Vegas. (Jason Merritt/Getty Images)
Photos: Britney Spears through the years 2016: Singer Britney Spears performs at the Jingle Ball 2016 on December 2, 2016, in Los Angeles. (Christopher Polk/Getty Images)
Photos: Britney Spears through the years 2017: Singer Britney Spears attends Pre-Grammy Gala and Salute to Industry Icons Honoring Debra Lee at the Beverly Hilton on February 11, 2017, in Los Angeles. (Kevork Djansezian/Getty Images)
Photos: Britney Spears through the years 2018: Honoree Britney Spears attends the 29th annual GLAAD Media Awards at The Beverly Hilton Hotel on April 12, 2018, in Beverly Hills, California. (Alberto E. Rodriguez/Getty Images)
Photos: Britney Spears through the years 2019: Britney Spears and Sam Asghari attend Sony Pictures' "Once Upon A Time ... in Hollywood" Los Angeles Premiere on July 22, 2019, in Hollywood, California. (Matt Winkelmeyer/Getty Images)
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