The feud between two of America's favorite pop stars Katy Perry and Taylor Swift is still going strong. Unfortunately for Taylor, she is not in a good spot with a great deal of her peers including Kanye West, Kim Kardashian, and Calvin Harris who all have attested to her shady behavior. Katy Perry took to Twitter on Friday to respond to a fan's questions if the two ladies would ever work together again. Perry's response? "If she says sorry, sure!"