"I'm officially Mrs. Blackstock," Kelly, 31, tweeted on Monday, sharing three beautiful pictures from the wedding. "We got married yesterday at Blackberry Farms in TN, the most beautiful place ever!".
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The blushing bride wore a Temperley London 'Jessamine' wedding gown that featured a plunging neckline, lace overlay, long sleeves and a train.
Her blonde locks were loosely pulled back, accessorised with a pretty headband, and she held a bouquet of sunflowers, mixed with white blossoms and Bluebonnets, the official flower of Texas, her home state.
In the first picture, the newlyweds can be seen standing in front of a rustic bridge, with the groom giving his bride a kiss on the cheek.
In the second picture, the couple share a passionate kiss as they stand in an open field, while in the third, smiling Kelly stands alone.
Blackberry Farm in situated in Walland, Tennessee, not far from the couple's home in Nashville.
They had already announced that they would tie the knot in an intimate ceremony, joined only by Brandon's two children, Savannah, 11, and seven-year-old Seth.
In August, Kelly confirmed they would elope in lieu of an extravagant wedding, explaining that the wedding planning process combined with the concern that details of their big day were being released, made them reconsider their plans.
After making their decision, Kelly and Brandon — the son of Kelly's manager — sent out an engagement photo and a message to their family and friends.
"Thank you so much for understanding, but it's just going to be me and Brandon and his two kids and the minister," the note read.
The happy couple first announced their plans to marry in December 2012. "I'm engaged!" the American Idol Season 1 winner wrote on Twitter.
"I wanted y'all to know! Happiest night of my life last night! I'm so lucky and am with the greatest man ever." Alongside the comment, Kelly showed off her beautiful yellow Johnathon Arndt diamond ring.