She summed up the experience on her Instagram account. "So last night kind of ruled..hugged an icon and high-fived a Prince," the music star wrote on her social media account.

Musgraves also posted a photo, which she captioned "When Texas Meets Royalty" and hashtagged Casual, High Fives, I Don't Know the Rules. The Royal Variety Hour will air on the UK's ITV in December. Check out Musgraves' Instagram posts - here.

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