The 'Since You've Been Gone' singer has announced she will marry the 35-year-old talent manager, who popped the question after nine months of dating.
The 30-year-old star, who shot to fame after winning 'American Idol' in 2002, shared her joy with her fans on Twitter.
"I am engaged. I wanted you all to know. Happiest night of my life last night! I am so lucky and am with the greatest man ever," she said.
Clarkson recently expressed her hopes that the couple would tie the knot even though they weren't yet engaged.
"We are totally going to get married. We love each other. We are totally going to get married one day. I mean, he's got to put a ring on at some point. But I'll wait it out," she had said.
