Aaron Rodgers LOSES Bet -- Probably Won't Pay Up ... Again

Aaron Rodgers -- NFL star and habitual bet weaseler-outer -- has LOST another major wager after famously betting his salary that Ryan Braun was PED-free ... but he probably won't pay up, 'cause that would be wayyyyyy out of character.

You may remember back in February, the Green Bay QB went to Twitter to defend his friend Braun against widespread allegations the Milwaukee Brewers outfielder was juicing.

One fan challenged Rodgers, saying, “you really believe he (Braun) didn’t you (sic) PED’s???”
And Rodgers responded: “ya, I’d put my salary next year on it.”

Well, now that Braun's basically copped to doping ... Rodgers is officially a LOSER ... and should have to pay the guy his 2013 salary -- $4.5 MILLION.

But as we all know, Rodgers has a history of not paying off his bets -- starting with the wager he made with Boyz II Men back in 2012 ... that the Pack would beat the 9ers in the season opener.

The Pack lost that game ... and Rodgers was supposed to wear a 49ers jersey. But he chickened out ... cause he's a great big, feathery CHICKEN.