Kelly Clarkson Dropped 20 Pounds for Her Boyfriend!

The Duets star said her romance gave her the motivation she needed to get back into shape

It seems Kelly Clarkson is getting pretty serious about her boyfriend Brandon Blackstock -- and it turns out he's having a positive effect on her health, as well as her happiness. The American Idol alum (pictured left in January and right on May 15) has lost 20 pounds recently, and she credits it all to him.

"I would love to say that it had something to do with my work, but it doesn't," says the 30-year-old pop star, who flaunted her new figure on last night's premiere of her new singing show, Duets. "I have a boyfriend, and if I'm being completely honest, no one likes to be not toned when you are dating someone."

"I'm eating better and working out, but I've always fluctuated within 20 lbs.," she added during a conference call this week. "My whole life I've been like that."

Clarkson also says it helps that she and the Nashville-based talent manager, whom she's been dating since late 2011, share the same trainer. "I tone whenever I want, and I chose to now because my boyfriend and I are both really into it," she says. "But we don't work out together. We did that once and I didn't like huffing and puffing...I didn't like looking all red and gross, so I don't do that."

We have to admit that we're impressed by Clarkson's mindset going into her relationship -- especially since so many are inclined to head the other direction when they get comfortable with their partners!

But while she may not admit it, we're guessing Clarkson's professional life also has something to do with her weight loss. (After all, she is under a lot of pressure debuting a brand-new series!) Duets is currently filling the singing competition gap left between American Idol and The X Factor.

Like those shows that came before it, Duets is searching to find the next great singing sensation and will award the winner recognition and a recording contract with Hollywood Records. Considering that's how Clarkson was found back in the first season of American Idol, it's fitting that she's taken on a starring role in this show alongside Robin Thicke, John Legend and Jennifer Nettles.

"The simple fact that I get to go out and find two people I believe in, sing with them every week and help them accomplish their dream is an amazing thing I can't wait to be a part of," Clarkson tells People.

In an interview with Us Weekly, Clarkson admits that she signed on to Duets because it felt like more than just a reality competition to her.

"I have been approached before and I've said no, but this was different because ABC actually approached me at an awards show and sold it to me like an awards show," she says. "The best parts on an awards show is when different artists get to collaborate. Like when Tim McGraw and Nelly sang together, you're like 'What?!' But it works!"

Duets airs Thursdays at 8 p.m. on ABC.

Watch the entire first episode of Duets below!

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