Pregnant 'Fixer Upper' Star Joanna Gaines Shares Sonogram of Baby No. 5

"Look at the little heartbeat!!"

Chip Gaines is already wagering on whether his wife, Joanna, is pregnant with a boy or a girl.

After the Fixer Upper couple revealed that they are expecting their fifth child on Tuesday, Joanna shared a sonogram video with her Twitter followers the next day. 

".@chipgaines swears he can already tell it’s a boy," she quipped. "Look at the little heartbeat!! ❤️❤️ #5."

The Texas natives are already parents to two sons, 12-year-old Drake and 9-year-old Duke, and two daughters, 11-year-old Ella and 7-year-old Emmie Kay.

Chip and Joanne broke the baby news by sharing a hilarious photo. "Gaines party of 7.. (If you’re still confused.. WE ARE PREGNANT) @joannagaines," Chip captioned the announcement pic, which showcased both mom and dad's "bumps" under their matching forest green tops.

Chip, 43, and Joanna, 39, announced in September that they would be ending their popular HGTV show after its fifth season, in part to spend more time with their kids. A month later, they insisted during an interview with ET that the show was not winding down because Joanna was pregnant.

"There's so many [rumors], even leading up to it -- I had this skincare line, so I'm leaving. It made it look like I was doing my own thing and Chip didn't even know about it. That was just a big rumor," Joanna told ET's Kevin Frazier. "That our marriage is on the rocks... I was pregnant. It's funny when you start hearing this stuff. I was like, 'I guess people can just make stuff up.'"

The reality stars may not have known they were pregnant when they spoke to ET back in mid-October. According to Chip's social media post, their fifth pregnancy can be traced back to JOHNNYSWIM's Oct. 12 concert in Waco, Texas.

"...They put on a little too romantic of a concert.. anyways, one thing led to another, & we are officially pregnant. And I could not be more EXCITED! #5 #7ThePerfectNumber," Chip wrote in part, to which the band adorably responded, "We do what we can!"