'Kourtney is for sure my favourite sister right now': Kylie Jenner takes over her big sibling's nude photo shoot

Kourtney Kardashian's transformation from the other sister to the chosen one is now complete.

And what momentous event officially marked the changing of the tide? Kourtney, 36, has won the gushing approval of her little sister Kylie Jenner, 18.

"Kourtney is for sure my favourite sister right now," Kylie said when she stopped by during Kourtney's nude photo shoot for a fine-art gallery exhibit.

She then proceeded to play director as her big sibling struck her unclothed poses. Watch the behind-the-scenes peek from Keeping Up with the Kardashians in the video above.

Well, if Kourtney's hard body doesn't make her other sisters jealous, Kylie's ringing endorsement just might do the trick.