Stay-at-home mom Messer shares twin daughters Aleeah and Ali, 3, with ex-husband Corey Simms, whom she divorced in April 2011. She married pipeline engineer Calvert a year later in June 2012.
"There is a reason God gave the baby to us now," Messer told Us Weekly exclusively in November 2012 of her third pregnancy. "I'm not going to say it wasn't planned, because we intended to try -- eventually. It just happened a little sooner than we expected. Our parents are thrilled. It'll be Jeremy's parents' first grandchild, so they're really excited."
"The path I chose isn't right for everyone, but it's right for me," she explained. "I am financially stable -- we just bought our first home -- and I'm emotionally fit to have another child. I'm 100 percent prepared -- way more than I was at 16."