New BFFs? Worlds collided when Katy Perry saw Ed Sheeran standing outside her BBC Radio 1 interview in London. She jokingly called him out for knocking her new song "Chained to the Rhythm" from the top spot with his new music. He then joined them in the studio for a chat. It turns out the two met years ago, but it might be awkward to have a friendship now with Ed being one of Taylor Swift's best friends and Katy being her sworn enemy! Just stick to music guys!