Kendall and Kylie Jenner are creating their own mobile game.

The sisters, aged 19 and 17 respectively, have revealed they are to follow in the footsteps of their older half-sibling Kim Kardashian West by developing an app based on their own lives.

Announcing the news on Instagram, Kendall wrote: ''We couldn't wait to tell you any longer! Excited to announce that we are working on our own mobile game! #KendallKylieGame #staytuned (sic)''

Last year, Kim, 34, launched her own game for mobile phones, 'Kim Kardashian: Hollywood', in which players can pretend to be a rising celebrity pal of the reality TV star.

The news comes just a fortnight after the two youngest 'Keeping Up with the Kardashians' sisters were added to Kim's game, which has been downloaded more than 23 million times and made around $74 million in 2014.

Kardashian family matriarch Kris Jenner was thrilled to reveal the news on Twitter, writing: ''It's a family affair! Girls rule! Welcome @KendallJenner & @KylieJenner to #KimKardashianHollywood!!! (sic)''

However, Kim is yet to comment on the announcement and and it was recently claimed she and Kylie are ''competitive''.

An insider previously said: ''If Kylie feels competitive with anyone it's Kim. She feels they have similar body types and looks. Kim is doing modelling, fashion, television and much more which is exactly what Kylie wants. She doesn't want to be put in a box and only do one thing.

''She wants to be like Kim, but even bigger and more diverse - getting into music and producing as well.''

eww