floyd mayweather and manny pacquiao fight in las vegas on may 2 .
both men are nearing the end of their respective training camps .
singer mariah carey paid a visit to mayweather 's boxing gym .
pacquiao made his latest appearance on jimmy kimmel live !
read : floyd mayweather vs manny pacquiao tickets finally go on sale .
jeff powell : mayweather now the mature man who weighs words carefully .
click here for all the latest floyd mayweather vs manny pacquiao news .