Over the weekend, Murgatroyd posted a lengthy apology after having to leave the Texas stage on Saturday because her "legs were giving out."
"I woke up feeling a little nauseous but I was able to go about my day with Shai," Murgatroyd wrote in an Instagram post on Sunday, referring to her 1-year -old son she shares with Maksim. "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."
She described the experience as "very embarrassing" and "very scary."
"I am so sorry for not being able to give you the show you all deserved," Murgatroyd continued. "I am feeling better today and look forward to seeing all of our fans."
While DWTS fan favorites Murgatroyd and the Chmerkovskiy brothers are busy on tour through mid-May, the new season of the reality dance competition series premieres Monday night with an all-athlete cast. Among those competing for the coveted mirrorball trophy are retired basketball star Kareem Abdul-Jabbar, figure-skating champ Adam Rippon and former figure skating pro Tonya Harding.
Season 26 of Dancing With the Stars kicks off Monday night at 8 p.m. ET/PT on ABC. Stay with ET as we liveblog the premiere!