Sources close to the former couple tell us the blowup went down last month while Reggie and Kim were at the L.A. wedding of his Saints teammate Bobby McCray and her friend Khadijaq Haqq.
We're told Reggie started chatting up Kim about working things out and getting back together -- totally understandable, by the way, considering how Kim looked that night (above). But you know how wedding receptions go -- lots of booze.
Sources tell us the convo got more and more heated and Reggie got more and more "aggressive due to drunkenness." We're told it never got physical, but eventually bodyguards stepped in to "pull Reggie away from Kim."
At about 1:00AM the bodyguards got a cab for Reggie and one for Kim and sent them home.