Kyle Richards has reportedly threatened to sue Brandi Glanville.

Kyle Richards Opens Up About 'RHOBH' Season Six Casting Rumors

Following a series of tweets, in which Glanville claimed her Real Housewives of Beverly Hills co-stars exploited her sister Kim's sobriety and ruined her other sister's husband's business, Richards has reportedly threatened to take legal action against Glanville.

Who Does 'RHOBH' Star Kyle Richards Think Is Spreading Rumors Of Her Being Fired?

Last week, after Richards and her co-star, Lisa Vanderpump, insinuated Glanville had been fired from her full-time role on The Real Housewives of Beverly Hills during an interview with TMZ, Glanville slammed Richards on Twitter.

Glanville also had a few words for Vanderpump.

Despite Glanville's full-time role being cut from The Real Housewives of Beverly Hills, she recently confirmed she will return to the show -- and that she had already began filming season six.

The Real Housewives of Beverly Hills season six is expected to premiere later this year.