Whether he was making his first cameo, as a baby, in Craig Mack's "Flava in Your Ear" remix video or later, posing in ads for his dad's clothing line, it seems that we've all watched Diddy's son Justin Combs grow up before our very eyes. Time sure does fly by as tonight, he'll blow out 16 candles. Find out how Diddy recently celebrated his 40th birthday. 2009 was a busy year in music. Find out how Diddy and other performers fared.