Rolling Stone Mick Jagger is stinking rich. Not just because he's the front man for one of the biggest rock bands ever, but also because he's a savvy businessman.

He didn't spend all of his money on frivolous junk. He reinvested it into solid business ventures. As such, he's even stinkier rich -- plus he's got all the bennies of being a rock star.

Unfortunately, lightning doesn't always strike twice for celebrities. While the business of being a celebrity seems to work for them (at least for a while), they often back other really bad business ideas.

When you live in the rarefied air that celebrities do, good ideas seem to have weird twists on them. The ideas get even weirder the further down the celebrity food chain you go.

Here are five of the most bizarre (and awful) business ideas celebrities (and often "B" Listers) have concocted.

No. 5: Heidi Fleiss' pet spa

In the mid-1990s, Heidi Fleiss came to national attention when she was convicted of running a high-bucks celebrity prostitution ring. While she made stacks of cash selling sex to the rich and famous, once out of jail (she served a 20-month sentence), she floundered around. Apparently school guidance counselors are right -- running a high-priced celebrity call girl ring won't take you through to retirement.

In 2010 she moved to her latest venture -- she opened a pet spa in Las Vegas called "Dirty Dog Laundry."

The infamous celebrity Madame might have been able to sell sex, but when it came to pet grooming she was more or less chasing her own tail. In other words, the business closed its doors within a few months.