This takes the cake! Maksim Chmerkovskiy and Peta Murgatroyd are having a baby boy, multiple sources confirm to Us Weekly.

The couple first offered a major hint about their baby’s sex at the mom-to-be’s 30th birthday party on Thursday, July 14. 

Murgatroyd’s Instagram photo of her birthday cake shows that it was decorated with blue frosting and a pair of tiny blue baby booties. It appeared to be a gift from Chmerkovskiy, 36, since “Happy 30th Peta” and “I love you both!” were written on the three-tiered creation. While she didn’t come right out and say it, fans took the color scheme to mean they’re having a baby boy.

🎂 Cake and Kisses for 3 @maksimc 😍

A photo posted by Peta Murgatroyd (@petamurgatroyd) on

In the pic posted on Friday, July 15, the lovebirds share a kiss behind the elaborate dessert. Murgatroyd captioned it, “Cake and Kisses for 2 @maksimc.” The Dancing With the Stars beauty, who is about 15 weeks along in her pregnancy, even showed off her growing baby bump at her birthday celebration with a black crop top and high-waisted pants.

Chmerkovskiy shared a sweet birthday message for his fiancée as well. “Happy birthday @petamurgatroyd,” he wrote along with a mirror selfie of the pair. "I can’t wait to tell our kids stories about these pictures and I don’t know how you manage to get hotter every day, but I am infinitely more attracted to you now then ever before! And 30s are so much better than 20s! Trust me … I know #dirtythirtyneverlookedbetter.”

While Murgatroyd initially kept her pregnancy under wraps, she has been flaunting her belly on Instagram in recent weeks, even posing in a tiny cheetah print bikini. In another pic, she wears a sports bra and workout pants as former DWTS pro Chmerkovskiy kisses her tummy

Us Weekly confirmed in May that Murgatroyd — who just won season 22 of DWTS with partner Nyle DiMarco — and Chmerkovskiy are expecting their first child. The couple got engaged in December 2015 after dating on and off for three years. The Ukrainian ballroom champ proposed to his love during a performance of Sway at Miami’s Olympia Theater. “I’m in love with you and I want to be in love with you for the rest of my life,” he said in front of the whole audience. “Will you marry me?”

Can't get enough of Us? Sign up now for the Us Weekly newsletter packed with the latest celeb news, hot pics and more!