Katy Perry, 31, is simply looking for an apology from her longtime nemesis, Taylor Swift, 26. The “Dark Horse” songstress took to Twitter on Sept. 10, and blew our minds when she gave a short and simple response to a fan question. When asked if she would consider collaborating with the pop star, Katy responded, “if she says sorry, sure!” OMG! This definitely comes as a major shocker, considering the two have reportedly been at odds for quite some time. Who knows what these two powerhouse vocalists could create if they actually worked together!