Does it seem a bit strange to you that Hef girlfriend Kendra Wilkinson's fans are underage...and we're talking real underage - from about 2 to 6!

We're guessing these kids just thinks she's a life-sized Barbie Doll and don't really get that she's part of Hef's Playboy harem, but Kendra couldn't have been nicer to her young fans.

She waited until the kids all went away to take their naps or something before dropping some s-bombs and talking about partying for her birthday tonight.