If you want to hire, say, the Rolling Stones for a two-hour private concert, you should expect to shell out millions. But let's say you're having a party and you just want a celebrity to make an appearance or a famous singer to show up and do a few songs -- how much will that set you back?

As with everything else, it depends, and is largely dictated by supply and demand. But take a look at what some stars have earned in the past for minimal effort.

Kim Kardashian: $300,000

Want America's most famous attentionista to show up at your event? Hope you have deep pockets -- she was paid $300,000 just to ring in the New Year at a Vegas nightclub last year, and in 2010, she racked up more than $500,000 from appearances during the week of her 30th birthday.

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Paris Hilton: $250,000

“About five years ago, Paris easily commanded $500-750,000 for nightclub appearances,” a source told Radar Online earlier this year. But it seems those days are over -- back in February, she "only" got $250,000 to celebrate her birthday at a club in Tahoe. *sad trombone*

Pacific Coast News

Simon Cowell: $100,000

The 'American Idol' and 'X Factor' personality supposedly charges 100 large just to grace you with his presence. We're guessing for that price, he might even let you audition for him and insult you for free.

Pacific Coast News

Charlie Sheen: $200,000

When Sheen lost his 'Two and a Half Men' gig in 2011, he still found a way to make money: hosting parties. In fact, he was reportedly offered $200,000 for a night of debauchery in Vegas -- plus a private jet transport and his hotel room, of course.

Theo Wargo, Getty Images

Beyonce: $1 Million

On New Year's Eve in 2009, Beyonce pocketed at least $1 million for singing just five songs at a show in St. Barts. But once she found out her performance had been funded by the son of (now late former) Libyan dictator Muammar Gaddafi, she donated the money to charity.

Christopher Polk, Getty Images

50 Cent: $75,000

Fiddy's fee might seem like a pittance compared to the others here, but since all he had to do was show up at a London club opening three years ago, drink with some pretty girls, and utter one word to the crowd -- that word was "hey," FYI -- we'd say he made out like a bandit.

Paul A. Hebert, Getty Images

Lindsay Lohan: $350,000

When LiLo was gearing up for her 21st birthday back in 2007, Pure nightclub in Vegas paid her $350,000 to spend the big night there. Unfortunately, Lindsay never made it -- she was in rehab instead. But 45 days later, she celebrated her release by "soberly" partying at the club. (This might explain the many rehab stints that followed.)

Pacific Coast News

Jon Stewart: $500,000 and up

According to booking agency CTI, the popular 'Daily Show' host will hang out with you for between $500,000 and $750,000. Domestically, at least. International fans will have to pony up at least $1.5 million. (Personally, we think it'd be worth every penny.)

Comedy Central

Jennifer Lopez: $1.2 million

A Russian billionaire paid J. Lo just over a mil to do a 40-minute set at his and his wife's joint birthday party in 2007. Oh, and he spent another $800 grand on travel and accommodations for Lopez, then-husband Marc Anthony, and what we're assuming was a massive entourage.

Scott Barbour, Getty Images

Selena Gomez: $100,000

As recently as 2010, Selena would show up at your event for a mere six figures. But that was then and this is now -- and since her star has risen so much lately, you can bet her asking price has too. (Kick in enough and she might even bring Justin Bieber along.)

Kevork Djansezian, Getty Images