Cody Johnson surprised fans at his Las Vegas concert, not only by playing a stone country classic, but bringing Lainey Wilson on stage to sing it with him. The two duetted on a fan-pleasing version of Willie Nelson and Waylon Jennings' classic "Mammas, Don't Let Your Babies Grow Up To Be Cowboys" to close out the second of his sold-out shows at the MGM Grand Garden Arena. If you're going out, that's the way to go. Check out the performance below
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