Upton announced the pregnancy on Instagram on Saturday in a post with the hashtag "pregnant in Miami" where she tagged Verlander.
Verlander has not commented publicly on the news.
Kate is now in Miami on buisness as shes's mentoring new models taking part in a Sports Illustrated Swimsuit's #SISwimSearch event. The ceremony took place just a few days after Verlander helped the Houston Astros win their first-ever World Series, during which Upton cheered on her hubby the entire time.
It is unknown as to whether or not Justin is in Miami with her as she breaks the news. In it, the Astros' star said in part, "I'm so proud that our little one is going to be raised in this world by a woman like you!"
The couple married past year, shortly after Verlander's Houston Astros won the World Series, and do not yet have children.
"I got to marry my best friend", she told the magazine.