March 25, 2016 08:00 PM

It’ll be a little princess for the Hermers.

The baby Ladies of Londons Marissa Hermer is expecting with husband Matt Hermer in May is a girl, she reveals to PEOPLE exclusively.

“Matt and I were totally shocked when the doctor told us we were having a girl — I just assumed we would have another boy so was planning out little Hermer football team,” she said.

“Now every time we go back for a scan, we ask if she can please check again as we still can’t really believe it. But looks like we will be adding a little princess to our brood!”

Courtesy Hermer Family

The reality star announced her pregnancy in December with an adorable family photo on Instagram, in which she shows off her baby bump with her husband as their two sons — Max and Jake — stand at their feet.

“New addition to our #HermerFamily,” she captioned the photo.

So, how do the little ones feel about bringing home a sister in just a few months?

They’re not exactly excited just yet.

“When we first told our boys that they were going to have a sister, they said, ‘YUCK! We want a BOY! Girls are gross!'” Hermer jokes to PEOPLE. “The boys have loved helping decorate the nursery — or rather, turning her basinet into a pirate ship and pretending her new pink lampshades are pirate hats.”

Well, that’s one way to get acquainted with baby girl Hermer.

— Naja Rayne

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