The 'Real Housewives of Beverly Hills' star has two sons, Mason, nine, and five-year-old Jake, with the actor and although she doesn't approve of his relationship with the singer, she wants their boys to have a stable life.
She said: ''I hope it works out because I don't want my kids to go through a divorce again.''
However, Brandi is not a fan of LeAnn's and said she ''can go f**k herself'' during a Q&A session for her new book 'Drinking and Tweeting: And Other Brandi Blunders'.
She added: ''Well, she has to, because who would want to?''
Eddie left Brandi in 2009 after he began an affair with LeAnn - who was also married at the time - after meeting her on the set of TV show 'Northern Lights' and Brandi admits she never saw it coming.
She said: ''I loved so hard - I loved my children and my family was perfect. I did everything I could do for him and the boys and to make him not want to stray.
''So, when it happened, especially with someone as attractive as her...''