Kourtney Kardashian Instagram - Kourtney's baby shower seemed truly beautiful. And the best part was that all the Kardashian sisters were there. Almost all the sisters, actually. What happened to Kendall Jenner?

The Kardashian sisters tend to be avid users of Instagram and show a lot of their daily lives through there. So, when the baby shower for Kourtney Kardashian appeared all over their accounts, it was no real surprise.

Kourtney celebrated the event at the Montage Hotel & Resorts in Beverly Hills, according to Us Weekly. At the time, she posted pictures that showed the reality star with her sisters. But, Kendall Jenner and Kris Jenner were not there.

As her Instagram showed, Kris was on a trip with friends. She posted the picture yesterday and even waved "Bye!!!!" in it. Now, the question is, where was Kendall and why didn't she attend Kourtney Kardashian's baby shower?

According to Hollywood Life, a good and solid theory is that Kendall Jenner was with Justin Bieber at the time. Nothing about it was found on her Instagram, but on Bieber's there was a little video of them taking coffee.

Lately, a lot of rumors were going around about the both of them dating. And even though Kourtney Kardashian didn't specify anything about her sister, Khloe did.

"We miss you our little croissant @kendalljenner," the other reality star posted on her Instagram account.

Kourtney's baby shower was a "Breakfast at Tiffany's" event, where there was food, luxury, style, and a lot of sisterly love to celebrate the occasion of another addition to the family.

Even though two of the members didn't attend, the love and celebration for them was still there. And Kourtney Kardashian was the happiest one, with reason.

"Breakfast at Tiffany's. Thank you to @kimkardashian and @khloekardashian for the magical, unforgettable perfectly charming baby shower," she shared on Instagram to remember the event.