Hollywood's unofficial couple, Justin Bieber and Kourtney Kardashian is spotted almost everywhere. And although they seemed to be simply enjoying each other's company, an insider said that the two love hanging around but could not keep their hands off each other,a Hollywood Life report said.

The 21-year-old singer and the 36-year-old reality television star were having a lot of fun and their sizzling new romance is the headline of almost all gossip columns! They may not be a serious couple yet but they are enjoying the attention of their not-so-secret dates despite their age difference.

Reports also said that the two originally wanted their relationship to be kept low-key but they simply struggle to keep their hands to themselves. The insider, someone close to Justin, said: "They've been hanging out and messing around," the source added. I don't see it becoming anything serious because the difference in age is too great and Justin likes being single, but they are having fun together."

The most recent sightings of the two were at The Nice Guy located in West Hollywood and at the Montage Hotel in Beverly Hills. People who saw them at the A- list West Hollywood lounge said that Justin and Kourtney were seen laughing together and touching each other. And as for onlookers spotting Kourtney at Justin's favorite hotel, they saw the TV star exiting the hotel at around 4AM allegedly without her bra!

On the other hand, sources say that Kourtney is just using the singer to make her ex-husband Scott Disick jealous. The "Keeping Up With The Kardashians" star is still all over her ex and was humiliated by his cheating ways.

"This is the perfect way to give him a taste of his own medicine." The source added.

But it is the other way around for the Believe singer. Reports say that he is genuinely into Kourtney and that he likes older women. He loves dominant, experienced women who knows what they want. The mother of three star does not play childish games and the singer loves this.

"His respect level for Kourt is through the roof because of it."