Even though the love birds Justin Bieber and Selena Gomez have announced that they’re going to do a Love Tour in Canada in 2012, the gossip mill is saying there might be some troubled waters on the horizon!

Macarena Lemos, a young model from Argentina, is telling the tabloids that she met the Canadian star in Buenos Aries recently and had quite the sexy sleepover!

Although she’s being quite mum about the details, we’ve learned that she’s saying they fooled around for awhile and eventually– Say isn’t so, Justin– even had sex with the 17 year old!

Now, we know how young girls’ work. Who wouldn’t want all their friends thinking they banged the Biebs? But according to sources close to the singer, he’s known for getting a little antsy while on tour and away from his girlfriend for long amounts of time.

What do you think? Is Justin just another Hollywood cheater?