Bunny Ranch owner Dennis Hof says the two hookers who snapped a pic with Bill Clinton at a charity event last week were invited guests of his ... and nobody kicked them out of the party. Hof tells TMZ ... he was approved by the charity to bring two dates to the Unite 4 Humanity event -- Barbie Girl and Ava Adora -- and even promoted the charity's party to his supporters via newsletter.
The HBO star says his entire group went through security and were given wristbands because they were all on the list ... and not one of them was kicked out of the party -- despite sources close to the event claiming otherwise.
Dennis adds, "how the f*** did we get there if we weren't invited?!"
Pimps up.