Blake Shelton, Miranda Lambert -- Officially Single ... Judge Signed Off on Divorce

Blake Shelton and Miranda Lambert are officially single ... we've learned the judge just signed the divorce docs.

TMZ broke the story Blake and Miranda are ending their 4-year marriage and Blake filed for divorce. We now know Blake filed his papers 2 weeks ago.

It's ultimately up to the judge to make sure everything's kosher and the divorce will go through, and that just happened. There's a shorter waiting period in Oklahoma than other states.

As we reported, the divorce was easy since Blake and Miranda had a prenup.

Blake posted a pic just 2 days ago showing his wedding ring on the appropriate finger. We're told as of today the ring is history.