Kelly Clarkson has denied rumors she has decided to elope with fiance Brandon Blackstock because she's knocked up.

"FYI ....Brandon & I are getting married & no I am not pregnant. We are eloping for one reason only. We both want an intimate ceremony," the 31-year-old first-season American Idol winner and former Duets celebrity partner tweeted Thursday.

Clarkson announced earlier this week she's ditching her previous plans for a big fall wedding at home and eloping instead because the couple has so much going on and got overwhelmed with the planning and details leaking.

Clarkson has also taken on the stepmother role for Blackstock's two children, who are six and 12-years-old, so she says their family life is busy nevermind their demanding careers.

Clarkson and Blackstock sent an engagement photo out to everyone they had mailed a save-the-date to with their apologies.

"[We]... said, 'Thank you so much for understanding, but it's just going to be me and Brandon and his two kids and the minister,'" Clarkson told People.

"Our whole life is a celebration. That's what we kept laughing about. We don't need another day where we throw a big party. Our lives are so in the spotlight all the time. Everything is such a spectacle, we were like, 'We would rather have an intimate moment that's special."

Clarkson revealed in April that The Voice coach Blake Shelton would be officiating her wedding, as he apparently played a big role in the singer and Blackstock getting engaged on December 15.

Blackstock is the son of Narvel Blackstock, Clarkson's manager, and stepson of country singer Reba McEntire, who became friends with Clarkson after the women performed a duet on American Idol in 2002.

Clarkson signed with Narvel Blackstock's Starstruck Entertainment management company in 2007 following a feud with recording industry titan Clive Davis over the musical content of "My December," her third album.