Jessie James Decker/Instagram
December 11, 2017 01:30 PM

Bump, there it is!

On Sunday, Jessie James Decker — who’s expecting her third child, a baby boy, with husband Eric Decker — showed some skin as she posted a photo of her growing baby bump on social media wearing just a bra and a pair of leggings.

“#Preggovibes #23weeks #whosayspreggocantbesexy #babyboy #babynumber3,” the 29-year-old wrote alongside the saucy snap.

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RELATED VIDEO: “Bump Is Out!” Jessie James Decker Shows Off Growing Belly as She Starts Feeling Kicks

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In November, the country singer told PEOPLE that while her 3½-year-old daughter Vivianne “Vivi” Rose is excited to have another sibling, she had been a little disappointed when she found out she wasn’t getting a baby sister during the couple’s October gender reveal.

“I 100 percent was happy either way,” said the third-time mom-to-be. “We told her [I was pregnant and expecting a boy] back-to-back — we filmed at the same moment, I just saved the gender for later — but I wanted to be able to tell her [I was pregnant] and then tell her the gender right after, so she didn’t get her hopes up.”

“I knew she wanted a baby sister — I really wanted either one because we have one of each,” continued the Southern Girl City Lights singer, who’s also mother to Eric “Bubby” Thomas Jr., 2. “When I found out it was a boy, I was so excited, but I was like, ‘Her little heart’s gonna be disappointed.’ Because all she kept saying was, ‘I want a baby sister. Jesus, I want a baby sister.’ ”

Eric Decker (left), Eric Jr., Jessie James Decker and Vivianne
Khloe Kardashian/Snapchat

RELATED: “Caught!” Jessie James Decker Discovers 2-Year-Old Son Opening Christmas Presents Early

The good news for Vivi is that she does have a close female playmate in Jessie’s niece: Brooklyn Rae, the 3-month-old daughter of Jessie’s sister Sydney Rae Bass.

“I keep telling her, ‘You have a baby sister,’ ” the pregnant star said of the advice she gives her daughter. ” ‘You don’t even realize, but [Brooklyn]’s your sister. You’re good. You guys’ll grow up together.’ ”

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RELATED GALLERY: They’re Expecting … Again! Eric and Jessie James Decker’s Sweetest Family Pics

And while Jessie added that she and her NFL star husband, 30, already have a name picked out, they’re not ready to share it yet.

“We had names picked out before we knew the gender,” she told PEOPLE, hinting that the baby boy will also be named after a character from one of her favorite southern-themed movies (their daughter was named for Viviane in Divine Secrets of the Ya-Ya Sisterhood).

Continued Jessie, “Even before we knew we were having baby No. 3, we always knew all of our kids’ names.”

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