TINSLEY Mortimer‘s reality show is not living up to its billing. The CW project claims to “lift the cur tain on New York’s most talked-about ‘Park Avenue Princess’ and her young, elite society friends” — but we hear none of Mortimer’s friends want anything to do with it. Her half-brother Peter Davis said over the weekend on Facebook that he has “zero interest in playing a warped, twisted version of myself on television.” We also hear that Zani Gugelmann and Dani Stahl turned down starring roles. “The only person definitely on board is [sister] Dabney Mercer,” says our source. A message left for producer Andrew Glassman was not returned.