"Ok, just saw my engagement shoot pics & I have to share one!!! :) Thanks @kobyb & @TerilynBrown! Ready to #TieItUp!" tweeted the elated singer, as she posted the photograph online.
Kelly, 31, got engaged to talent manager Brandon Blackstone in December 2012. "I am so lucky and am with the greatest man ever," she said. The couple are set to tie the knot on 20 October 2013.
The former American Idol winner misplaced her diamond engagement ring and other jewellery during a Country Music Festival in June. Her engagement ring has been valued at around $150,000 (approximately £97,000).
She eventually found the jewellery and shared her relief on Twitter. "For all my concerned fans I FOUND MY RINGS!!!," she wrote. "Seriously, panicked in my head all night long... so did Brandon haha!"
The Because of You singer chose her actual wedding dress, by designer Vera Wang, back in February. "It is my personality in a dress," she told People magazine. "It's sweetly damaged. A little rock'n'roll. A little tattered. Nothing like a princess thing!"
Other celebrities who have worn Vera Wang on their wedding day include Kim Kardashian, Khloe Kardashian Odom, Mariah Carey and Jennifer Lopez.
Kelly and Brandon's wedding will be officiated by The Voice judge and country music singer Blake Shelton. Kelly has admitted that she is nervous about her big day.
"I'm terrified of everyone watching me walk down the aisle," she said. Kelly has also confessed that she is "overwhelmed" with the wedding planning and "literally had a breakdown about the wedding list".