Kendra Wilkinson: Dani Mathers Is a Rotten Apple ... Leave Playboy Out of This!

Kendra Wilkinson is NOT standing shoulder to shoulder with fellow Playmate alum Dani Mathers -- in fact, she's going off on her for the despicable gym sauna pic.

We caught up with Kendra at LAX and she didn't mince words about the former Playmate of the Year. Check out the vid ... she's clearly pissed at Dani for mocking an unwitting woman.

She's also got beef with anyone trying to drag Playboy into Dani's mess.