According to TMZ, which seems like the most reputable source on the subject, Rodgers bet the Boyz's lead singer that if the 49ers won, A-Rodg would wear an Alex Smith jersey all week -- while if the Packers had pulled it out, the lead singer (whose name doesn't matter because he's the lead singer of Boyz II Men) would wear a Rodgers jersey all week.
In other Aaron Rodgers News You Can Use, his hometown of Chico had previously put up a sign proclaiming it the "Home Of Aaron Rodgers #12," only to see the sign taken away, and replaced (temporarily) with a sign proclaiming the town the "Home of Brett Ratliff," only to see that taken down.
Fans of Ratliff, who hasn't appeared in an NFL game and who presently seems to be on the Titans' roster, started a fight that has resulted in Rodgers getting no honors:
“We ultimately took (the Ratliff sign) down, and right now, there is no more sign up there,” [a member of the sign committee] said. “I didn’t want my Chico sign to become a turf war. … But knowing Aaron, he’s probably just as happy with his sign not being there.”
Yes. That is probably true. If Aaron Rodgers is anything, he is a man who doesn't want public recognition of his achievements.