Congratulations are in order for Rascal Flatts' bass player and CMT's Allison DeMarcus, who have announced they have another little one on the way!

The new bundle of joy is expected to arrive some time this summer, according to a release sent out on Wednesday morning. The pregnancy was a bit of a shock for the couple who wed in 2004 and are already the parents to 1-year-old daughter Madeline Leigh.

"This was definitely a huge surprise, but we're so thankful and excited that Maddie is going to have a brother or sister," says the soon-to-be new daddy. "We're really gonna have our hands full!"

"Jay and I are thrilled about completing our family," adds his bride. "Madeline is going to love having a sibling, and we are bracing ourselves for the many sleepless nights ahead."

While they prepare for the arrival of their new baby, fans can catch DeMarcus with his bandmates -- Gary LeVox and Joe Don Rooney -- on the road as part of their Thaw Out Tour, which kicked off on Jan. 12. The band's latest musical arrival is their new single, 'Banjo,' which is the first release from their upcoming album, 'Changed,' set to hit stores on April 3.