Kelly Clarkson is engaged.

The 'Since You've Been Gone' singer has announced she will wed 35-year-old talent manager Brandon Blackstock, who popped the question last night (14.12.12) 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, writing: ''I'm engaged!!!! I wanted y'all to know!! Happiest night of my life last night! I am so lucky and am with the greatest man ever.''

Kelly recently expressed her hopes that the couple would tie the knot even though they weren't yet engaged.

Last month, she said: ''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.''

Asked if she has thought about the kind of wedding she wants to have, the 'Stronger' singer said: ''Honestly I've never been the girl to plan a wedding. We will totally, probably elope.''

Kelly previously called their relationship her ''best accomplishment'' after years of being unlucky in love.

She said: ''I completely fell in love. I did! Welcome to Cheeseville! I don't know. Your priorities kind of shift and you become happier and all that stuff. It's probably my best accomplishment because I think, for me, especially, I just didn't think it would happen.''