Rupert Sanders - K-Stew's Married Lover WEARING WEDDING RING

Rupert Sanders -- the philandering director who cheated on his wife with Kristen Stewart -- wants the world to know he's still married (at least for now) ... 'cause he's proudly sporting his wedding ring.

Sanders finally emerged in L.A. just a few hours ago -- it's the first time we've seen hm in public since those crazy scandalous photos emerged showing the "Snow White and the Huntsman" director -- and father of 2 -- making out with his lead actress ... who was also in a committed relationship with Robert Pattinson at the time.

Sanders released a statement a few days ago ... begging his wife to not dump his adulterous ass. It's unclear if she's made a decision yet.