Kris Jenner says the cosmetics company she endorses has NO RIGHT to sue her for getting plastic surgery back in June … because the procedure didn’t affect her face … it just tightened up some loose neck skin.

The company in question — called B&P — sued Jenner earlier this week, claiming she breached a contract to endorse a line of their anti-aging skin care products … when the famous mother publicly admitted to getting a facelift.

By doing so, B&P alleges, Jenner violated her agreement not to harm the reputation of the company and the product she’s endorsing — an eye care line called “Beautiful Eyes in a Bag.”

But sources close to the Kardashian Klan tell TMZ, Kris is adamant … the lawsuit is BOGUS — because Kris’ facelift didn’t affect her eyes in any way whatsoever … JUST HER NECK.

Kris’ alleged agreement with B&P went into effect in March 2011 and was to be effective until March 2012 — but Kris admitted … she got the facelift in June.