Taylor Swift's Swastika Photo

Taylor Swift in mess after posing with a fan wearing a swastika.

Paint-partying and a chocolate factory weren't the only wildness at Katy Perry's birthday party in West Hollywood last weekend. A report has caught fire that a guest donning a white t-shirt emblazened with a giant swastika on the front is leaving Taylor Swift, with some 'splainin to do.

The theme of Katy Perry's birthday party was for her guests to dress in head-to-toe white for a big paint-splattering fiesta. Most guests turned up as blank canvases, but the one showing a ballsy affinity for the Nazis cozied up next to Taylor Swift and gave a cringe-worthy grin. Swift smiles sweetly as usual, not indicating any issue with the fellow's t-shirt.

Now her rep is back-pedaling, saying Taylor Swift had no idea what was going on. They've released a statement with the following: "Taylor took pictures with about 100 people that night ... she doesn't know who this guy is and she didn't realize what was on his shirt."

Um...Tay-Tay? How could you miss it? Visit our friends at PopEater -- they'll show you a glimpse of Taylor Swift and the swastika mess.