"We've known each other for years, but we didn't start talking until the Super Bowl last February. And this is the funniest/worst thing ever: One of my superhero idols is Whitney Houston, and the day she died was our first date. I was like, 'This is a bad omen!'"
Clarkson was proven wrong when Blackstock proposed in mid-December with a $150,000 engagement ring. "Six years I was single before this," the inaugural American Idol winner muses. "I've never been truly loved like I am right now."
"Brandon's totally The One," Clarkson adds. "I've never been so happy."
Clarkson -- who previously dated singers Graham Colton, 31, and Justin Guarini, 34 -- was rumored to be in same-sex relationships before meeting Blackstock.
"People think, 'Oh, she's been single for too long.' That's kind of an insult to the gay community. Being single doesn't mean you're gay," the pop star tells Cosmopolitan. "But I'm never insulted by it. I mean, I get hit on by the hottest girls ever. Oh my god, If I was a lesbian, I would be so in luck. But it's just not my thing. I've always batted for the boys' team."