Kendall and Kylie Jenner have launched a website for a secret project. The sisters teased their collaboration by opening an Instagram account a month ago titled "Kendall + Kylie." E! Online broke the news about the website, which so far offers little information.

Upon opening the site, fans are asked to sign up for a VIP mailing list. “Surprises coming, share your email for priority access,” reads the opening message.

Once the guest has signed in, an email is sent to the registered address. The message includes more teasers about Kendall and Kylie’s secret project. The email reads: "We can't wait to show you what's up our sleeve. Members get secrets before anyone else. As one of the first to secure a spot on the list, you'll be notified the moment new Kendall + Kylie items are available -- only here. This is the list, and you're on it. Hope you like surprises."

On the Kendall + Kylie Instagram page, more clues point toward the nature of the project. One photo contains sketches of clothing designs. The caption reads simply: “Dreams in progress ... ” Another photo shows the sisters going through a catalogue of different clothing items. Kylie holds a diagram that contains a selection of tops, jackets, skirts, pants and other clothing. They appear to be choosing the designs they like best.

This project is only the latest among several collaborations between the sisters. They have already launched fashion collections with brands like PacSun, Steve Madden and Topshop. Stay tuned for more updates on their newest project.