Justin Timberlake & Jessica Biel -- Wedding Video Mocks Homeless People

Justin Timberlake and Jessica Biel's wedding party featured a video that openly made fun of homeless people in L.A. -- this according to reports.

Gawker just posted the video -- reportedly made by Timberlake's real estate agent friend Justin Huchel -- which depicts what appears to be REAL homeless people on the streets of L.A., acting as Justin and Jessica's friends who couldn't make it to the ceremony.

The homeless people in the clip -- one toothless, the other shirtless -- wish the ultra-rich couple well on their new lives together ... saying things like, "I hope the wedding goes fine for you. My gift is in the mail."

The video's an obvious dig at Justin and Jessica's ridiculous wealth -- juxtaposed against the destitute poverty displayed in the clip. The video also features a transvestite.

Huchel -- who once dated Amanda Seyfried -- has already threatened to sue Gawker over the video, claiming it was shot as "a private joke" without Timberlake's knowledge ... and demanding it be taken off the web ASAP.

Calls to Justin and Jessica's camps were not returned.