Vivid to Spencer -- Show Me the Sex Tape!

8/29/2010 5:00 AM PDT

Vivid to Spencer Pratt -- Show Me Heidi's Sex Tape!

The Heidi Montag sex tape has thus far been all talk from Spencer Pratt -- and now the president of Vivid Entertainment wants Spencer to show his hand.

Steven Hirsch tells TMZ he isn't going to down to Costa Rica to meet with Spencer about the sex tape -- until Spencer coughs up a preview. Specifically, Hirsch says he wants to see at least 30 seconds of whatever it is Pratt's got.

As we first reported, Pratt is asking for at least $5,000,000 for his library of footage. Hirsch says he asked Pratt to send him some kind of preview because he doesn't want to be part of any publicity stunt. So far, he hasn't seen a frame.

Looks like we'll find out soon if Spencer is bluffing ... or if he really has Heidi's pair.