"Me and my date #cmtawards," McGraw, 49, captioned an Instagram photo of the two in what appeared to be a limo.
McGraw and the 17-year-old sat front row during the star-studded show. The "Humble and Kind" singer wore an all-black outfit and his trademark cowboy hat while Maggie shimmered in a knee-length dress.
The country superstars, married since 1996, are also parents to Gracie, 19, and Audrey, 14. The entire family attended the Time 100 Gala together in NYC in April 2015.
Last year, McGraw opened up about how he handles his daughters' dating lives and possible suitors. "I mean, I have sledgehammer. I want it to be visceral," he joked during an appearance on Rachael Ray's talk show. "No, I'm not that tough. I mean, I try to act like I am, but I just want them to be happy. I want them to have a good time."