It's no secret that the brokers on Million Dollar Listing Los Angeles and New York deal with some fabulous mansions, and who else can afford a million dollar mansion other than the stars? With their insane credentials and insane-er pricepoints, the real estate agents of Million Dollar Listing get to deal with celebrities all the time. And yes, that's on and off-screen.

So what's it like trying to sell a multi-million dollar estate to an Oscar winner or for a reality TV star? According to Los Angeles' Josh Altman, you need to be careful with celebrities and always on top of your game. "They're very good at what they do, and they expect you to be very good at what you do." Still, he insists he treats all of his clients the same. "I don't care if they're a mega-celebrity, I don't care if they're a mega-businessman." At the same time, he stresses he treats all clients equally, whether they're a "mega-celebrity" or "a mega-businessman" (the only two true categories).

Don't kid yourself, though, Josh definitely has a high profile favorite. Scroll down to see which stars the Million Dollar Listing brokers have worked with.