Kesha performing in Mexico last yearA seemingly innocuous social media post from Kesha has led some fans to ponder whether she’s throwing shade at Katy Perry.In the early hours of Tuesday morning, the Blow singer shared a selfie on X in which she was seen enjoying a milkshake from the US fast food chain Wendy’s.But how does that have anything to do with Katy? And why would there be beef between the two of them anyway?Well, here’s a quick guide to bring you up to speed…Hang on, aren’t Kesha and Katy Perry friends?Kesha and Katy Perry pictured together in 2010