Pink wasn't going to let a flu diagnosis keep her from giving the performance of a lifetime at Sunday's Super Bowl LII.

Just days before taking the stage to sing the national anthem, the singer shared on Instagram that her children gave her the flu.

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“Trying to practice the flu away,” the singer wrote on Saturday. “I’ve been waiting to sing this song since 1991 when I saw my idol, Whitney Houston, own this song. And now, my chance has finally come. And it just so happens that this chance comes when I have two small Petri dish kids who literally cough INTO MY MOUTH and rub their snot on my cheek. You can’t write this stuff I swear!”

MINNEAPOLIS, MN - FEBRUARY 04:  Recording artist Pink performs the National Anthem during the Super Bowl LII Pregame show at U.S. Bank Stadium on February 4, 2018 in Minneapolis, Minnesota.  (Photo by Christopher Polk/Getty Images)

Credit: Christopher Polk

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Credit: Christopher Polk

Wearing a stunning silver cameo top and silky jacket, Pink nailed every note of "Star-Spangled Banner." The camera panned over the Patriots and Eagles players, who all seemed to be blown away by her performance.

Related: Photos: Pink performs the national anthem at Super Bowl LII

Before she belted the anthem, cameras caught Pink tossing something out of her mouth. It wasn't missed by Twitter, most users of which assumed it was gum.

As it turns out, it was a throat lozenge, which Pink confirmed in a tweet.

It’s common for singers to have a lozenge before performing, and wouldn’t be unusual for someone battling the flu.

Watch Pink perform the national anthem at the big game below.