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There was a famous Taylor in the stands at the Chiefs game Sunday night -- and for a brief moment, the New York Giants had everyone believing it was Travis Kelce 's fiancée.

The epic fakeout went down early in Kansas City's matchup with the G-Men at MetLife Stadium ... when the home team played Taylor Swift 's song, "Welcome to New York," while panning through the crowd.

Most expected the payoff to be a shot of Swift in a luxury box ... but instead, the cam landed on a different Taylor -- Lawrence !!

L.T. was seen smoking a cigar -- before he flashed a big ol' smile. Giants fans seemed to eat it up -- though Swifties weren't exactly amused.

The moment actually caught the attention of the game's broadcasters, Mike Tirico and Cris Collinsworth , who both chuckled a

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