It's hard to keep up with Justin Bieber's love life. After getting rejected by Selena Gomez, he reportedly spent a lot of time with good friend Hailey Baldwin, daughter of actor Stephen Baldwin. But last weekend, the popular singer was seen partying all weekend with reality television star turned supermodel Kendall Jenner.

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The pair first went to P. Diddy's son, Justin Dior Combs' 21^st birthday celebration last Saturday. After celebrating, Justin and Kendall went to the Biebs house in Los Angeles, which sparked the sleepover speculation.

On Sunday morning, the fresh-faced model was seen hanging out with Justin on his trampoline wearing clothes which looked liked the same ones she wore the night before - blue pants, white shirt and red scarf. However, seeing the pair together does not really come as a surprise, as they have always been open about their friendship.

So are they really just friends or not? The pair rekindled the dating rumors when they were not only spotted spending the night together, but when they were also seen going on a hike together in Runyon Canyon after the sleepover.

Is this part of Justin's revenge after news about ex-girlfriend Selena Gomez dating DJ Zedd surfaced? It's highly unlikely. Kendall has made it completely clear that they are only friends and it really looks like they are just that this time. They weren't spotted holding hands or kissing anyway, and Justin is rumored to be moving on to one of Kendall's best pals, Hailey Baldwin.

TagsJustin Bieber, Kendall Jenner