VIDEO : Scarlett Johansson Hosts SNL, Performs Sexy Dance and Congratulates Floyd Mayweather Jr.

Scarlett Johansson hosted SNL for the fourth time on Saturday, a day after the U.S. release of The Avengers: Age of Ultron, in which she reprises her role as Black Widow.
The 30-year-old actress also played the part on the NBC sketch comedy series, in a skit that shows what a Black Widow standalone film could look like?if it were marketed toward woman. She also showcased her dancing and singing skills and congratulated Floyd Mayweather Jr. for winning his aniticpated pay-per-view boxing match against Manny Pacquiao, dubbed "the fight of the century."??