Credit: Sears Photo: Kourtney, Khloe, and Kim in Kardashian Kollection Lingerie Ad

When people suggest the Kardashians are famous for doing "nothing," we kind of have to laugh. Because contrary to popular belief, the girls are always doing something, whether it's opening a new store, attending promotional parties, launching clothing lines, endorsing a product, "writing" a tell-all memoir, or — in Kim's case — getting married and then divorced on television.

E! recently revealed that Kim Kardashian earns $5.45 million a year and rakes in $40,000 per episode of her reality shows. Kourtney's individual net worth is estimated to be $4 million, and Khloé is worth a pretty penny, too — and not just because hubby Lamar Odom is worth an estimated $70 million.

According to The Daily Beast, Kim raked in $6 million in 2010. And that, they point out, is a conservative estimate. Khloe and Kourtney both brought in $2.5 million.

The youngest Kardashian sister caught flack from bloggers earlier this summer for reportedly giving Lamar a Rolls Royce she bought with his money. "People r so pathetic," Khloé tweeted. "Y would I give some1 a gift w/ their money? That's lame. I actually make my own money. Shocking I know. Stop hating!"

Yes, she does make her own money. And a lot of it. Khloe's individual net worth is an estimated $2 million. True, she may owe $18,490.74 in back taxes from 2007, according to TMZ, but that's a drop in the bucket.

Along with their little brother Rob Jr., Kim, Khloé, and Kourtney also receive money from the estate of their late father, O.J. Simpson defense attorney Robert Kardashian Sr., so they can each tack on an estimated $25 million to their fortunes.

But who spends the most money? The sisters dished to Entertainment Tonight that there's no debate there: It's Kim!

Sources: NY Daily News, Celebritynetworth.com, Celebritynetworth.com, UsMagazine.com, TMZ, ETOnline

Credit: Glamour Photo: Khloe Kardashian: "I'm Going to Have Sex in Public Just to See What Happens" (VIDEO)