Clarkson also shared several photos from her big day with her followers -- Blackstock kissing her on the cheek while the couple stands on a wooden bride, the pair kissing on a grassy hill, and herself standing on a walkway with a big smile on her face.
Clarkson apparently wore a long-sleeved lace gown designed by Temperley London and carried a bouquet of small purple flowers and big yellow sunflowers. She also swept her hair up and accented her dress with a sparkly headband.
"Thnx Temperley 4 my beautiful dress!" Clarkson captioned one of the photos on Twitter. "And thank you to my friend @JimVerraros & Maria Elena 4 the beautiful headpiece!"
Clarkson is currently getting her pilot's license and flew herself and Blackstock to Tennessee for the ceremony, according toUs Weekly, after which Blackstock flew them back out.
Clarkson and Blackstock, a 36-year-old talent manager, got engaged on December 15.
Clarkson announced in August she wanted to ditch her previous plans for a big fall wedding at home and elope instead because the couple got overwhelmed with the planning and details leaking. Their family life with Blackstock's two children, who are six and 12-years-old, is also demanding -- nevermind their careers.
Clarkson's unexpected announcement sparked speculation the pair was going to elope because Clarkson was pregnant. However, the singer quickly shot down the rumors.
"FYI ....Brandon & I are getting married & no I am not pregnant. We are eloping for one reason only. We both want an intimate ceremony," Clarkson tweeted at the time.
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.
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