"I need to apologize to the people who attended our Grand Prairie, Texas show last night," the performer wrote in a statement, explaining that she has "never missed a show due to illness in my entire professional dancing career."
"I woke up feeling a little nauseous but I was able to go about my day with Shai," Murgatroyd continued, referring to her and her husband's 1-year -old son. "In the afternoon, the vomiting (and you know what) started. I thought it was food poisoning. I had fever and chills and just tried to sleep it off before the show."
Murgatroyd said that, as show time rolled around, she "could hardly walk and I couldn't feel my arms or legs."
"I had no idea how I was going to walk out that door. The opening music starts and I walked out onto stage. I tried my best to dance, but my legs were giving out," she recalled. "Apart from it being very embarrassing, it was very scary. I am so sorry for not being able to give you the show you all deserved."
Maksim Chmerkovskiy and Peta Murgatroyd on How They'll Juggle Parenting on Their New U.S. Tour! (Exclusive)
The post came several hours before she is expected to take the stage for Sunday's tour stop at the Midland Theatre in Kansas City, Missouri.
While Murgatroyd and the Chmerkovskiy brothers --all of whom are DWTS regulars and fan favorites -- are busy on tour, the new season of the hit reality dance competition series premieres on Monday with a super-short season featuring a cast made up entirely of athletes.
Among those competing for the coveted Mirrorball trophy are Kareem Abdul-Jabbar, Adam Rippon and Tonya Harding. Check out the video below to hear more.