Keyshia and Boobie just aint workin out

Keyshia Cole is officially pulling the plug on her marriage to ex-NBA player Daniel "Boobie" Gibson -- 3 months after revealing they had split.

Sources close to the singer tell TMZ she's already drawn up divorce papers and we're told she plans to file them any day now. The couple has a 4-year-old son.

Keyshia and Boobie had 2 wedding ceremonies ... the first in May 2011, and then a bigger -- aka expensive -- one four months later in Hawaii. One divorce will get the job done though.

Interestingly, Cole just released a new single called "She" which seems to allude to a female lover: "Down to try something different/Lips and legs/Soft skin so feminine/Curves like me/Covered in my cherry scent."

Maybe unrelated. Possibly just art. Definitely hot.