So far, Yo says his wife is having an "easy pregnancy."
"No morning sickness. Hallelujah!!" he exclaims. "I’m so excited. Whenever she needs me, I am there -- from massages to cooking. I can’t wait for the baby moon!"
Needless to say, Yo is very excited about fatherhood. "I can’t wait to pass along all the great things my parents have taught me about treating everyone equally," he says. "Living your dream and hopefully one day, he or she will be able to change the world."
The couple's baby news comes just a month after they celebrated their one-year anniversary of when Yo first popped the question. The two couldn't help but gush about their proposal on Instagram.
"I said 'YES' one year ago today!" Simmons exclaimed four weeks ago, along with an adorable shot of the couple. "@michaelyo makes me the happiest girl in the world! I love you forever and ever Michael!"
"One year ago I got engaged to the most incredible women in the world @claireelisesimmons," Yo wrote in his own post. "She is now my wife/EVERYTHING to me. You make everyday worth living, I love YOU!"
Yo, 41, and Simmons, 29, wed on Feb. 14, 2016, in a gorgeous Valentine's Day ceremony in Pasadena, California. The newlyweds said “I do” surrounded by friends and family, who donned the color red in celebration of the holiday.
The couple had been dating since 2013.
Yo and Simmons aren't the only ones focusing on all things baby -- Lance Bass revealed to ET last week that he and his husband, Michael Turchin, are hoping to expand their family.
"We plan on doing the baby thing ourselves sometime soon," Bass gushed, before sharing that he would trust fellow *NSYNC member JC Chasez to babysit.