Like all TV personalities with a half decently sized social media following, Kylie Jenner has released a calendar for 2017 so that you can have her on your wall all year round. 

Photographed by the controversial photographer. Terry Richardson, the calendar is jam packed full of risque photos of the 19 year old. 

That's not the real selling point of the calendar though. The main attraction is the pretty major gaffe in the month of August in the calendar. As you can see in the image below, there is a little 'note from Kylie' reminding fans that she is "20 today" on August 20th. 

(Pic via TMZ)

There's only one small problem with that. August 20th isn't Kylie's birthday. 

Jenner's birthday is August 10th, not August 20th.

According to TMZ, this wan't a one off either and all of the calendars which have been sold exclusively on her website have the same mistake.

So if you bought one, don't worry too much. You might be able to sell it as a collector's item one day?