Yep. That's going on with my kids as well. I just have to keep telling myself, "At least she's being nice, at least she's being nice..."
It doesn't make it any less annoying, though. I'm still hoping that the OW in my situation comes to her senses and abandons STBX's ship before it sinks in a horrific way that will hurt both her children and mine, but considering that she also acts like a teenager (including the Skyping with my kids, though not on my time), I don't think that's going to happen.