Michelle Phan. Stefanie Keenan Photography YouTube has exploded since it first launched in 2005, becoming the de facto launchpad for the next generation of internet celebrities.

It's no secret that YouTube's biggest stars are using sponsored videos and advertising to make a living on the platform, in addition to just making a name for themselves.

But who on YouTube is getting paid the most?

Forbes just published its look at which YouTube stars make the most money. The publication based its rankings on raw, pre-tax estimates of earnings that are derived from "data from Nielsen, IMDB, and other sources, as well as on interviews with agents, managers, lawyers, industry insiders, and the stars themselves."

Forbes says most of the YouTube millionaires on its list get paid through ads, previews, and sponsored videos. Some of the people on its list also have their own side businesses and book deals.