DeAnna, 33, is anticipating giving birth in February 2016, which is the same month she and her husband Stephen Stagliano will be celebrating their older daughter Addison Marie's second birthday.
"So excited to finally share that we are expecting #BabyStag2," DeAnna, who starred on The Bachelorette's fourth season, captioned a photo of her baby bump on Instagram. "We are so full of joy and so blessed!!"
Stephen is the twin brother of Michael Stagliano, who was one of the bachelors on Jillian Harris' season of The Bachelorette in 2009 and then won Bachelor Pad's second season with former fiancee Holly Durst in Summer 2011. Michael returned to compete on Bachelor Pad's third edition the following year.
Michael introduced DeAnna and Stephen, who got engaged in August 2010 and wed in October 2011 in a ceremony that took place in Palmetto, GA.