LOS ANGELES - Brody Jenner, the son of Olympic champion Bruce Jenner and stepbrother to celebrity sex-tape star Kim Kardashian, is making porn connections of his own these days.

According to the gossip site celebuzz.com, adult performer Reno recently made an uncredited guest appearance on Jenner's MTV reality show "Bromance". The episode featured Brody and his bros facing off with a tough "biker dude" in a boxing-ring challenge.

An eagle-eyed viewer identified the mystery "dude" as Reno, an eight-year jizz-biz veteran who has performed in more than 300 adult videos. While Reno has worked for just about all of the major Porn Valley producers, it was his association with the Miami-based studio Reality Kings that gave him away.

"You know that biker dude also did a bunch of porno for Reality Kings right?" the anonymous Internet source remarked. "Haha, just look up Pure 18....Nasty!"

Brody Jenner previously starred in MTV's "The Hills," the E! Channel series "Keeping Up with the Kardashians", and the short-lived Fox network reality show "The Princes of Malibu".

"Bromance" is produced by Ryan Seacrest Productions.