According to the National Enquirer, after Hathaway poked fun at Holmes during a November appearance on 'Saturday Night Live,'
"Anne and Katie are longtime rivals," explains a so-called mag "insider," adding, "Anne puts forth a very genial, friendly image, but she has a wicked competitive streak. She doesn't like Katie because they used to go up for similar roles."
Hathaway "constantly makes fun of Katie behind her back, mocking her former marriage [to Tom Cruise] and even her appearance."
"It all comes down to the fact that Anne doesn't take Katie seriously as an actress. And Katie's gotten Anne's message loud and clear."
"Simply put, there is no love lost between Anne and Katie," says the Enquirer's insider.