PHOTO: Pacquiao takes chocolate bar selfie before weigh-in

Manny Pacquiao ain't worried about nothin'.

Ahead of his career-defining fight against Floyd Mayweather Jr. on Saturday, Pacquiao was in good spirits ahead of Friday's weigh-in and even took the time for a big Twitter selfie with a Butterfinger in hand.

Who's concerned about making weight? Not Mr. Pacquiao, apparently.