Oprah is facing another lawsuit -- this time, from a former employee at her not-yet-launched cable channel.

Catherine Dunn, a former assistant at the Oprah Winfrey Network, filed a lawsuit in Los Angeles Friday claiming she was "subjected to a hostile work environment" because she suffered from Multiple Sclerosis.

According to TMZ, Dunn is suing for wrongful termination, claiming she was made to take a leave of absence due to stress and her MS symptoms and then was replaced by "a non-disabled and younger employee."

OWN is a partnership between Oprah Winfrey and Discovery Communications. Over the weekend, the New York Post reported that Discovery was pouring more money into the network, doubling its initial investment. The network is slated to launch in January.

It's far from the first time the queen of daytime TV has been sued. In fact, she's something of a lawsuit magnet. (Most of the lawsuits never went anywhere.) Below, check out some of the many times Oprah's been sued during her career.

PHOTO GALLERY Oprah Winfrey's Many Legal Battles