Kelly Clarkson thought she had cancer during the 2006 GRAMMYs

Kelly Clarkson won her very first Grammy awards in 2006, but that's not why it was memorable.

The "American Idol" winner revealed the doctor diagnosed her with cancer the morning of the show, but she had to power through and keep the life-changing news to herself -- at least till after the big night.

Clarkson, now 34, won Best Female Pop Vocal Performance for "Since U Been Gone" and Best Pop Vocal Album for "Breakaway." She was also set to perform her hit ballad "Because of You" during the Grammys.

The singer, who is now mother to two adorable kiddos (Remington Alexander and River Rose), revealed to Billboard's Pop Shop Podcast that she spent the whole day crying after hearing the news.

"They redid my makeup, like, four times because I was like, 'Wow, so young.' I was just completely freaking out. Then when I won, I thought, 'Oh, my God. This is like God giving me one more thing before something horrible happens.'"

After during her acceptance speeches that night, it's clear why the songstress was so visibly emotional.

"Um ... oh, God! You know I'm terrible at speaking when I cry, so sorry!" she said after taking the stage to accept her award for Best Female Pop Vocal Performance. "Thank you so much. Ah! OK. Thank you to everybody that has supported me this year, including my record label and my management. Thank you to my mom. Thank you so much, Mom. I'm sorry I'm crying again on national television! Thank you to the fans. Thank you to everyone that worked on my record. Yikes! Just thank you so much. You have no idea what this means to me. Thank you so much!"

The next day, Clarkson received some good news from her doctor ... a misdiagnosis!

"I was like, 'You completely ruined my entire [experience],'" she said of her reaction to the doctor's revelation. "The first time for an artist ... as a kid watching the Grammys, that was a big dream! It was kind of the worst/greatest day. And the next day was also the worst/greatest day because I wanted to punch someone. I was like, 'Who mixes up results? Why wouldn't you test again?' It was very much a roller coaster ride, that day, for me."

And while Kelly had clearly had a WTF?! moment, she did manage to look at the bright side of things.

"Hey, I didn't have cancer!"

This year, we're hoping for a much different experience for Clarkson, who is nominated for Best Pop Solo Performance for "Piece by Piece." But she does have a lot of competition, going against pop stars Beyonce and Justin Bieber in the category.

The 59th annual Grammys will be held on February 12. Check out AOL.com's coverage of the big night here.

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