Well, this is embarrassing.
The reality star will turn 20 on Aug. 10, though on her personalized calendar the date is marked for Aug. 20.
"Kylie, I thought your birthday was Aug. 10?" one Twitter user asked.
"I got your calendar for Christmas and your birthdate is marked wrong, I noticed it because your birthday is two days before mine @KylieJenner," said another.
A third chimed in with, "@KylieJenner we share the same birthday of Aug. 10 but your calendar says Aug. 20 #stillcutedoe."
The youngest member of the Kardashian-Jenner family announced last month that she would release this sultry piece for the new year, which features a series of provocative photos shot by Terry Richardson. It can be purchased through the Official Kylie Jenner Shop for $22.
According to TMZ, it's possible the mistake appears on every calendar that was printed.
On a positive note, the August photo features a topless Kylie covered in cake.
This is not the only embarrassing scandal the 19-year-old is currently dealing with. She shared with fans on Twitter that she will no longer be posting to her app and all updates will be provided by her team and friends, after a post she claims she never saw or approved was published for her fans — and included racy details about her relationship with Tyga, 27.
"It's unfair to me and you to think that those were my words. I'm sorry and I know we will figure something out so we can all be satisfied," she wrote.
See more photos from Kylie's calendar in the gallery!