Seeing an ex with their new significant other at the Happiest Place on Earth wouldn't be very happy at all.
Luckily, it doesn't seem as though Taylor Swift had to experience such an awkward run-in firsthand, although the opportunity presented itself over the weekend.
A source confirms to E! News that the Red singer was at Disneyland yesterday with a group of friends, including Modern Family star Sarah Hyland, and it just so happens that her ex-boyfriend John Mayer was also visiting Mickey and the gang with his lady Katy Perry the same day.
Hyland tweeted, "BEST day at Disneyland w/ @ @ @ahellerPR @ & @ ! Love you all!!"
E! News reported yesterday that Mayer and Perry were spotted enjoying a day of Disney with a group of pals. They were each dressed casually, with the pop singer wearing shorts, a T-shirt and floppy hat, while rocker Mayer donned a baseball cap, plaid shirt and jeans.
A source told E! News that the couple was with a handful of other people and didn't engage in too much PDA, but stayed close together.
It's a small world, after all.
—Reporting by Lindsay Dale and Marc Malkin