In the adorable snap which Kelly shared on social media, the little one was smiling happily as she held on to the guitar which was a gift from Kelly's friends and fellow singers Miranda Lambert and Blake Shelton.
Kelly tweeted the picture of River sat next to the guitar, and added: "Aunt @mirandalambert & Uncle @blakeshelton 4 the win! She is destined 2 b a Country/Rock legend with this! Thnx guys"
Kelly later shared another picture of River cuddling with her father, Brandon Blackstock.
"Okay this is adorable @BBlackstock :) Had to share! River loves her daddy & morning time!" Kelly shared with her Twitter followers.
The former American Idol winner-turned-Grammy superstar, had spoken extensively about desire to become a mum, revealing in November 2013: "I want babies. Yep I do!
"Everybody keeps saying, 'What do you want for Christmas?' And I'm like, 'I want to be pregnant.'"
She later gave birth to River in June 2014 and announced her daughter's arrival on Twitter writing, "Our baby girl River Rose Blackstock arrived on June 12th! Thank you everyone for all of your well wishes! Brandon and I are on cloud 9!! :)".
She later shared a first look at her daughter on the social media site Twitter, with the young one looking peaceful in a unique vintage carriage pram, and the shot complemented the aesthetic used for Kelly's wedding photographs.