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Taylor Swift 's engagement has captured the world's attention ... but, it's taking a backseat this weekend -- 'cause she's focused on her pal Brittany's Mahomes !

The singer-songwriter was spotted in Nashville this weekend to live it up with Brittany on her 30th birthday weekend ... with new photos circulating online showing the pop star sitting down for a meal at a restaurant in the popular party locale.

Check out the pics ... they're a bit blurry, but it's certainly the music superstar sitting to Brit's left -- using a fork to dig into her meal.

Friends of Mahomes shared pics of Brittany on a private jet in a hangar Friday ... alluding to this quick trip to Nashville for her big birthday weekend -- so, we knew they were getting the party started. Getty

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