No, you're not going blind or overly tired. OK, you might be a lil' exhausted from the weekend, but that's not what's causing you to read that headline. Promise. Apparently Taylor Swift was performing in Atlanta this weekend and, um, she brought out T.I. (!?) to join her onstage. Yeah. Weird. He surprised the arena full of screaming tweens after she started singing Rihanna's hook to "Live Your Life." And after that, well, it's all shrieks and washed-out audio in the fan-shot footage below. You're here for the WTF factor anyway, so I doubt the muddy sound is going to break your heart.