"We are thankful and so happy Dylan will have a little sister to grow up with," the country crooner tells PEOPLE.

By peoplestaff225
April 29, 2014 04:00 PM

Kevork Djansezian/Getty

Pretty in pink!

Joe Nichols and his wife Heather celebrated daughter Dylan River turning 2 on April 17 with a birthday bash among family and friends.

“We had a party at Granny’s house. It was a princess party. I never expected to wear a tiara but when the 2-year-old birthday girl says, ‘Wear this, Daddy,’ I do it!” the country singer tells PEOPLE.

He adds, “There are some photos out there I’d probably like back.”

He’d better hold onto that tiara though. The couple are expecting their second child on May 20 — and their special delivery will be wrapped in pink.

“It’s another girl,” Nichols, who is also dad to daughter Ashelyn, 15, from a previous relationship, tells PEOPLE. “I’m so outnumbered — I am toast!”

Though Dylan is hoping for a puppy — “She points to Heather’s belly and says, ‘Puppy!'” — the couple are grateful to be expanding their family again, after experiencing five miscarriages before welcoming their first child together.

“[This baby is] a second miracle. Heather had to go through all that again — the appointments and treatments — but she is feeling great, getting big and the baby is moving like crazy,” the proud dad says.

“We got some great images on the sonogram last week and it’s so reassuring to see that. We are incredibly fortunate to have Dylan, and now to be expecting our second so soon, we are thankful and so happy Dylan will have a little sister to grow up with.”

Nichols is hoping their second daughter will look more like her mother than Dylan, who is “a mini-me” of her dad. “The hair, the legs, the face, even her back — Heather says that back won’t work in a prom dress!” he jokes.

The singer notched his first No. 1, “Sunny and 75,” from his current album Crickets in December and it was certified gold in January, the same time his new single, “Yeah” was released.

He is currently on tour, though thanks to FaceTime, “I talk to Dylan every day. What a great thing that is,” he says.

Nichols will be there in person for the baby’s birth. “We have blocked time off from the tour on either side of the due date. I wouldn’t miss that for anything,” he shares.

— Kay West