Krystal Keith, who released her first country album in 2013, revealed the news by posting a picture of her baby bump on

She writes in the caption, "So about that project I've been working on!! We are over the moon about expecting our first little bundle of joy!!"

Krystal and husband Andrew Robert Sandubrae have been married since 2010.

The baby will be Keith's third grandchild - his eldest daughter Shelley has two children.