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(TMZ) - Keyshia Cole's estranged husband shocked her by filing divorce papers before she could, or so it seemed ... but Daniel "Boobie" Gibson says it was actually an impostor - with a thing for El Pollo Loco - who did the deed, according to TMZ.

TMZ broke the story ... the singer was on the verge of filing for divorce last month, but still hadn't pulled the trigger when Gibson supposedly filed last week in L.A. County Superior Court.

TMZ obtained a copy of the docs which looked pretty standard ... citing irreconcilable differences. However, it seemed odd an ex-NBA player like Gibson would list himself as his attorney.

TMZ called the phone # listed for him in the papers - and the person who answered claimed he was Gibson, but sounded suspect. So, TMZ checked the address listed ... and it turned out to be an El Pollo Loco restaurant. Crazy, right?
The real Boobie assured TMZ he never once considered filing, telling TMZ ... "She would have to do it. I am a Christian. I believe in 'til death do us part.'"

Gibson says he's going to press charges against the impostor.

For her part, Keyshia tells TMZ nothing's changed - she still plans to go forward with the divorce. Sorry Boobie ... and fake Boobie.

Photo: Getty Images