Back in 2005 she was an unknown face who won over the country to win the fourth season of American Idol. 

Now, Carrie Underwood is a seven-time Grammy winner and the fifth highest-certified female artist in the U.S. 

The 37-year-old country singer took a trip down memory lane on the 15th anniversary of her Idol win, thanking fans in a tweet on Monday. 

Star: Carrie Underwood took a trip down memory lane on the 15th anniversary of her American Idol win, thanking fans in a tweet on Monday

'WOW, I cannot believe it's been 15 years since my @americanidolwin,' she wrote. 

Adding: 'It's been an incredible ride and I couldn't have made it through without all of you guys!! THANK YOU so much for this sweet video!!' 

Her message came in response to a fan who created a video honoring and celebrating the star. 

'We are so thankful you didn't have your dad turn the car around! Happy "Idol-versary,"' the fan wrote.  

Then: Back in 2005 she was an unknown who won over the country to win the fourth season of American Idol

Incredible journey: 'WOW, I cannot believe it's been 15 years since my @americanidolwin,' she wrote. Adding: 'It's been an incredible ride and I couldn't have made it through without all of you guys!! THANK YOU so much for this sweet video!!'

Carrie, who's been one of the few Idol winners to find mainstream success, her debut single Inside Your Heaven, released in 2005, debuted at number one on the Billboard Hot 100, making her the only country singer to debut in the top spot.  

She has gone on to win seven Grammy awards, 11 Billboard Music Awards and 15 American Music Awards. 

Billboard also named her the top female country singer of the last two decades.  

The blonde beauty, known for her stellar legs and fit figure, has since become a wife and mother-of-two.