Mel Gibson and Robyn Gibson are officially single -- a judge signed the divorce decree moments ago.
The only big change -- Robyn is going back to her maiden name ... so from now on it's Robyn Moore.
As we reported, the couple's been negotiating a financial settlement for over a year ... and we're told, it's finally a done deal. There is no prenup.
The couple's reported net worth is in the $900 million range -- but sources tell us, it's actually less.
Mel was represented by Larry Ginsberg.
Robyn -- who was repped by disso-queen Laura Wasser -- filed for divorce in 2009 following a three-year separation -- shortly after learning Mel's then GF Oksana Grigorieva was pregnant