These hills aren’t big enough for both Richards sisters!

An insider exclusively tells Life & Style that Kyle Richards has threatened to quit The Real Housewives of Beverly Hills if producers bring back her troubled sis Kim Richards.

RELATED: ‘RHOBH’ Star Kim Richards is Going to Be a Grandmother!

“Kyle put her foot down,” the insider reveals. “She’s concerned the fame and publicity will derail Kim all over again.”

kyle richards kim richards rhobh getty

Kim and Kyle argue on the RHOBH Season 5 reunion show.

Kim, who’s been in and out of rehab and was arrested for shoplifting in 2015, “has finally managed to get sober and take control of her life, but she’s still very vulnerable,” the source continues.

For more updates on the Real Housewives, pick up the latest issue of Life & Style, on newsstands now!