Melissa Rivers -- From the Oscars to the AVNs

Melissa Rivers is used to the awards show circuit, but now that dates porn king Steven Hirsch ... those awards show have a more XXX feel to them.

Rivers and Hirsch hit up the AVN Awards (pretty much the Oscars of porn) in Las Vegas last night. The couple happened to run into Joe Francis in the lobby of the Hard Rock Hotel, where the show was being held.