United Kingdom, March 5 -- Jesse McCartney and his wife are expecting a baby boy.

The 'Beautiful Soul' singer and his spouse Katie Peterson revealed last month she is pregnant with their first child and now the happy couple have shared a video of their gender reveal, for which they enlisted the help of their dog Bailey.

In a clip shared to Instagram, the couple sat outside on a blanket with a sign reading "Boy or Girl" in front of them, and the former Disney star told their pooch: "You're going to be a big sister."

Jesse and Katie, then counted down from three before closing their eyes opening a hamper in front of them to reveal a collar for Bailey, which was blue.

The 37-year-old singer-and-actor's mouth dropped open and he threw his...