Updated April 25, 2016 at 12:00 PM EDT
Credit: Steve Zak Photography/WireImage

Kevin Jonas is going to be a father of two!

The singer and former Celebrity Apprentice contestant announced the baby news on Instagram Monday writing, “Prepping for baby number two! #babyjonas2.”

Along with the caption, he shared a funny photo of himself reading a baby prep book while pregnant wife Danielle lies in bed next to him, surrounded by snacks.

The couple, who celebrated their six-year anniversary in December, are already parents to 2-year-old daughter Alena Rose, who was born in February 2014.

“We are excited to share the news that we are expecting a new addition to our family this winter,” the soon-to-be parents-of-two tell PEOPLE exclusively. “Alena is beyond thrilled to be a big sister and we can’t wait to meet the newest member of our family.”

In October, Danielle revealed to PEOPLE that she and Kevin were “always talking about” giving Alena a sibling.