They were first seen dating a few times and despite denying a commitment, things could be pretty serious between Kourtney Kardashian and Justin Bieber. Some friends are claiming that the 36 year-old is pregnant and she's expecting a Bieber's baby. Kardashian's eldest is already a mom-of-three, but the Canadian singer could become a father for the very first if these reports were confirmed.

Kourtney Kardashian has allegedly claimed that she is "tired of being the boring, responsible Kardashian", a source told to HollywoodLife.com.

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And Justin Bieber, a well-known party boy is helping her to "have more fun", after her marriage with Scott Disick come to an end.  

Dating with Justin Bieber

It was a bit of a shock when Kourtney was spotted dating with Justin Bieber, who was already a good friend to her younger sisters, Kylie and Kendall Jenner.

The pair never confirmed the romance, but friends claimed they became very intimate.

Despite being with Kourtney, Bieber kept his lifestyle and has been also spotted with model friend Hailey Baldwin. After his big romance with Selena Gomez, which last a few years, Bieber was never in a real relationship, as he keeps talking about Selena as "the one" of his heart.

Become a father

According to some friends, Justin Bieber "wants to be a father", and he's very happy about being a part of the Kardashian family.

Kourtney has already three kids with ex-Scott Disick: Mason, Peneloppe and Reign. Their relationship wasn't working anymore and she split from him, definitely. Scott was even trying a rehab, but Kourtney won't give to him another chance, according to some close sources. 

“She likes all the action around him [Justin]. Kourtney wants to be young and free again like her much younger sisters and Justin does that for her", a source revealed to HollywoodLife.com.

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After all the fun, things might become a bit serious, if the pregnant rumors were real. 

According to some friends, Kourtney told them she's pregnant again and that she's not seen Scott for a while, and the baby could only be the first Bieber's baby.