Lady Gaga and choreographer Laurieann Gibson have collaborated with each other since 2008. She created dance moves for the pop diva for practically every music video from The Fame album.

Media Take Out, however, reports that Mama Monster and the 42-year-old Canadian native may have gone their separate ways following a big fight.

An insider tells the website Gibson changed once she landed her own reality show The Dance Scene, explaining, "Laurieann is a bit of a diva, but she had her ego under control — [but] not anymore."

According to MTO, the Emmy nominee compared her boss to Madonna in a recent interview and got gruff on the phone with Mama Monster after learning she might be replaced.

The insider tells the website, "A lot of things were said, and it was very HEATED. Laurieann ended up hanging up [on Lady Gaga] and saying that she was SUING."