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Taylor Swift may've kept a low profile at fiancé Travis Kelce 's game Sunday, but she still had a good time ... as seen in a new post from the outing.

Kane Brown shared a snap from the weekend on Instagram Monday night, where he confirmed he and his wife, Katelyn , celebrated Patrick Mahomes ' birthday alongside Brittany Mahomes , Swift, and Kelce.

Check it out ... the Kansas City Chiefs QB's birthday turned into a date night after their game Sunday, with the 3 couples happily posing before grabbing a bite together at Kelce’s restaurant, 1587 Prime.

Brown confirmed the group had a lot to celebrate, shouting out Mahomes' big birthday and Swelce's engagement last month ... sweetly referring to the couple as "TT" in the caption.

Swift certainly seemed more at e

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