Colin Kaepernick -- I'M NO AARON RODGERS ... Makes Bet, Promises to Keep It

SF 49ers quarterback Colin Kaepernick just made a BET with Seattle Seahawks QB Russell Wilson -- whoever loses when they face off this weekend has to shave an eyebrow.

The wager was captured on video in a commercial for EA Sports -- they even shook hands -- and Colin warned Wilson, "Hope you don't like your eyebrow."

It'll be interesting to see if the losing QB actually lives up to the bet ... unlike Green Bay Packers QB/chicken enthusiast Aaron Rodgers ... who still hasn't paid up after losing a bet to Boyz II Men last season.

Just a warning to Colin and Russell -- don't let your mouths write checks your eyebrows can't cash ... you'll never live it down.

Right Aaron?