Sisters Kourtney, Kim and Khloe Kardashian sandwich their Glamour Tan Self-Tanning Gel. Courtesy Photo

The Kardashian sisters are at it again. Conjuring up their next greatest product, that is.

Known for their perpetually bronzed skin and curves, we're not surprised to see the girls are debuting their very own self-tanner.

Kardashian Glamour Tan will be the first release from their upcoming Kardashian Beauty line (which -- by the way -- we totally saw coming earlier this year), and will be available for $34 exclusively at Sephora stores nationwide as well as on Sephora.com.

"My sisters and I are all about getting the perfect tan without harming our skin. We're always on the lookout for the best self-tanner, so we thought we'd create the perfect formula and share it with everyone else," says Kim Kardashian.

The gel promises a natural, golden tan within 24 hours of application minus streaks and stains. The formula is loaded with antioxidants and vitamins C, E and D to keep gams moisturized after you apply. And it will be the only self-tanner available on the market that contains Imudulin, an ingredient that stimulates vitamin D production for an anti-aging affect that claims to soften lines and crepiness.

Instructions say to apply the gel to clean skin and allow it to dry for 20 minutes before dressing. You should see color appear over the next few hours, with full results clocking in within 24 hours. Reapplication every two to three days to maintain even color is suggested.

With all the event hopping and public appearances the A-list sisters make, we're thinking they must self-tan all the time -- and making their own won't just save them some bucks, but could end up cashing them some future spending money for shopping sprees. Or botox.

Who says these girls aren't business women? Now, if only they'd market their lip glosses -- every time we catch their show, we're mesmerized by their perfectly shellacked lips.

If lip lube is next up in the Kardashian Beauty line, you heard it here first.