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Taylor Swift attended Travis Kelce 's game today ... but, from FOX's broadcast and social media you'd hardly know it -- 'cause it looks like she snuck into the stadium!

While the singer-songwriter usually makes a splash when she shows up to Arrowhead Stadium to cheer on the Kansas City Chiefs, it seems no one got a good glimpse of her Sunday ... 'cause video of the star striding down the tunnel on her way to her suite didn't surface online. Gallery Launch Gallery Getty/Twitter/TMZ/Instagram

Plus, the TV broadcast seemingly didn't show her at all ... so, a few outlets previously reported she didn't pull up to take in the action this time.

However, sources confirmed to TMZ she was there ... and, it appears social media's figuring it out, too -- 'cause video has now sur

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