Musgraves took to Instagram to show off her new bling in front of a Christmas tree, which just happened to be decorated with red heart ornaments.
"I didn't say yes...I said HELL YESSSS!!" she captioned the Instagram pic on Sunday. "Last night, the best man I've ever met got down on one knee in my little pink childhood home..in the same room I played with my ponies and barbies and asked me the easiest question I've ever been asked. ❤ I finally know what everyone means when they say 'you just know.'"
On Christmas Day, the "Follow Your Arrow" singer posted a video of the tree and ring from new angles and filled fans in on how the proposal went down.
"We had just been at my parent's house randomly having a night of watching bittersweet old home tapes of all these beautiful family memories that were made in this little, old country house I grew up in that I now have," she wrote. "We came back to that house afterwards and he had somehow pulled off having my sister + brother in-law sneak off and completely decorate my childhood bedroom in the most nostalgic and perfect Christmas decorations."
"I was bewildered and confused when I saw it all and turned around and the song 'Two For The Road' by Henry Mancini was playing... and he was on his knee with a baby pink velvet ring box and the sparkliest thing I've ever seen!" she continued. "It was so beyond special. Of all the places in the world I've gotten to see, nowhere could mean more than this happening in tiny Golden, Texas in the house that completely made me who I am."
And, of course, Musgraves had to take a pic with her sneaky sister, Kelly, while still making sure her rock was all we were staring at.
"So thankful for my sister and bro in-law angels for helping make such a big day so sparkly and unforgettable," Musgraves captioned the sisterly snap. "Mae + Satsuki 4Ever ?? My heart is a puddle of glitter."
Kelly shared his excitement on Instagram as well, posting a black-and-white picture of the couple's hands on Sunday and writing, "I have never met a more incredible partner and woman. Last night I became the luckiest, proudest and happiest man ever. I asked the brightest light in my life to marry me."
The Nashville-based singer-songwriter shared another photo on Christmas Day, gushing over his bride-to-be, who looked overwhelmed but thrilled after the engagement. "What a moment that will forever be one of the happiest I've ever experienced... Happy to call them future sibs in law," he captioned the sweet pic. "And Kacey, I love you. Thank you for it all. Two for the road. MERRY CHRISTMAS."