Krista Stegall -- who appeared on "Big Brother" in 2001 -- tells TMZ she was in the bathroom at Bootleggers Bar in Lafayette, LA last month when Bernis allegedly stormed in, grabbed her arms, shoved her against a wall, and shouted, "this is my bar!" Stegall claims these photos (above) show the bruises she suffered in the alleged attack.
Stegall says she filed for a restraining order against Bernis last week. She claims she and Bernis -- who co-owns Bootleggers Bar -- were longtime friends, but never dated.
We were unable to reach Bernis for comment.