Ever since we first reported about Josh Kelley's and Katherine Heigl's new baby, we've been dying to get more details. We're happy to announce today that the wait is over! Mr. and Mrs. Kelley revealed more information about their new little family member to People, including her name: Adalaide Marie Hope.

"Her full name is Adalaide Marie Hope Kelley," Heigl explains. "Adalaide because of my great-grandmother, Marie after my middle name, and Hope because that is what the process became."

Before Kelley got engaged to his superstar wife, actress Katherine Heigl, both agreed that they wanted a family. And although the couple wants to have biological children one day, they started their family by adopting Naleigh -- their now 3-1/2-year-old first daughter -- from South Korea in 2009.

The tiny family was happy enough as a threesome, but earlier this year, both the country music singer and his wife hinted in interviews that they might have plans to expand their family unit. A few weeks ago, Heigl's PR rep confirmed that the happy couple had added to their family by adopting a new baby.

Now, Naleigh has a new baby sister! The newborn baby was christened Adalaide Marie Hope, and she was adopted domestically.

With a new baby at home, the big-hearted couple spent a quiet Mother's Day at their house. But the singer -- whose brother is Charles Kelley of Lady Antebellum -- still took the time to update Twitter followers about the family, writing, "HAPPY MOTHERS DAY !!!! Hope you dudes out there take care of your ladies. No skimping…" He even shared a photo of the breakfast spread he made for the mother of his children.

Although the Kelleys have just expanded their brood, the country crooner still plans to hit the road this summer. Surely, he'll be belting out 'Naleigh Moon,' a song about his oldest daughter and the first single from his 2011 'George Clay' album, at most of his upcoming shows.