These two have been fighting forever. Or at least since 2009 Kelly called Gaga a "butterface" and last year said that Gaga's fans have been telling her to go kill herself.
Sooo then Lady Gaga responded in a blog post earlier this year, saying Kelly needs to own up to being critical of people on her E! show...then Sharon called Gaga a "bully".
So here we are, this weekend Gaga presented Sharon with a bday cake for Kelly (Kelly was in the US, Gaga and Sharon were in the UK doing stuff for "X Factor").
Pardon the language but here's how Kelly responded, it seemed a little extra to me: