The actress has insisted that she wants Evans to be there when she ties the knot with Laurence Fox tomorrow.
However, her mother and father are said to be unhappy because they blame Chris for a rift that developed between Billie and her family when they were together.
"There have been lots of arguments about Chris going," a source told The People. "They think it's very strange. They were never very keen on Chris - and since they split up, Billie is close to her parents again."
Piper and Evans divorced in 2005.