Kylie Jenner launched her mobile app this week and it has soared straight to number one on iTunes. The Kylie Jenner Official App features make-up tutorials, favourite fashion picks and the 18-year-old has apparently told her followers that they can expect interviews from her close family and friends. Kylie and her sisters, Kendall, Khloe and Kim all launched paid websites this week but according to figures obtained by TMZ, Kylie is far and away the most successful. It's believed that 891,340 people signed up to the four websites within a 24 hour period and 74 per cent chose to subscribe to Kylie's app. Khloe came second with 10.8 per cent, Kim followed her with nine per cent and five per cent wanted to keep up with Kendall's adventures. Yesterday, Kylie took to Instagram to share a screenshot showing how her app reached the top spot. She captioned it: #1 I can't believe it. I love you guys. Can't wait to post more tomorrow".

#1 I can't believe it. I love you guys. Can't wait to post more tomorrow

A photo posted by King Kylie (@kyliejenner) on Sep 14, 2015 at 4:42pm PDT

Kardashian fans have queried why Kourtney is the only sister without an app but according to momager Kris Jenner, Kourtney's app is on the way. " "Kourtney's will be live next month. The girls have been working around the clock for a year on their apps and sites, and Kourtney gave birth to Reign in December. "While everyone else was deep in production, she was taking time with her infant, nursing and caring for her children. So, she's a little behind, but, it is going to be fabulous".