Kendra Wilkinson is XXX box office gold -- more so than Kim Kardashian, sources at Vivid tell TMZ.
We've learned the pre-sale orders for Kendra's sex tape are the biggest in Vivid Entertainment's history.
For you XXX historians, Vivid has distributed tapes with the likes of Kim, Mindy McCready, Shauna Sand and Kelli McCarty.
It's sweet payback for Kendra. Remember her husband fumbled the ball during the Super Bowl ... while Kim basked in the glory with Reggie.