CONCORD, CA - JULY 25: Singer Kelly Clarkson performs at Sleep Train Amphitheatre on July 25, 2012 in Concord, California.
C Flanigan

Less than a month after Kelly Clarkson told Ellen DeGeneres that she and her boyfriend were  "totally gonna get married" eventually, the singer's instincts were on the money. 

The first American Idol winner tweeted today:

@kelly_clarkson
Kelly Clarkson 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 :)
Dec 15 via WhoSay Favorite Retweet Reply

@kelly_clarkson
Kelly Clarkson 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 :)
Dec 15 via WhoSay Favorite Retweet Reply

The lucky man is Brandon Blackstock, son of her manager and the stepson of country singer Reba McEntire.  

Congratulations, you two!