The two photos show Miranda and her grandpa cracking up -- a frequent pastime for them, she explained.

\"He has the best stories and the best sense of humor,\" the singer told her fans. \"We were both laughing in pic 2 because he said, 'Who is taking the picture?' I said, 'Me...it's a selfie.'\"

Lambert's been enjoying a little downtime after the first leg of her show, \"Velvet Rodeo: The Las Vegas Residency.\"

She'll hit the stage once again in late November.

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