Justin Bieber and Tati Neves 'sexy night in bed' revealed [VIDEO]: Selena Gomez's ex 'fools around' with Brazilian model? 'What do you think?'

Justin Bieber's only 19-years-old, but the "Heartbreaker" crooner's already partying like a pro. And apparently Selena Gomez's ex is a HUGE ladies man. As Mstars previously reported:

The Biebs evidently had a little TOO much fun during his recent "Believe" tour pit-stop in Brazil.

First, the teen pop sensation was spotted at a brothel hitting on some prostitutes. Late on, he was wanted by authorities for "acts of vanadalism" after grafiting the side of a luxurious hotel.

Now, Bieber was caught sleeping in bed by a young Belieber named Tati Neves.

Neves posted this viral video on Nov. 7 entitled "Justin Bieber sleeping with a girl in Brasil" -

Apparently, the two enjoyed a wild night of partying together. Bieber eventually passed out in bed, with his tattooed arm and signature red baseball cap exposed. It remains unknown if the two actually spent the night together "fooling around," or if Neves just caught the Biebs in a vulnerable state the next morning.

Later on in the video Neves turns the camera on herself, smiles, and blows the pop star a kiss. She reveals a diamond ring on her left hand in the process.

An alleged insider tells UK's Daily Mail, "Justin was asleep in his villa when the video was taken... There were a bunch of guys and a bunch of women hanging out, not prostitutes. He fell asleep and someone walked in and took a picture."

Hmm... wonder if Neves has any more hot-and-steamy footage she was forced not to share...

Well, the aspiring model/bodybuilder is still keeping pretty mum.

In her first-ever interview with Globo TV, Neves was asked if she kissed the Biebs. Her response:

"What do you think, if I was sleeping in the bedroom, just me and him?"

According to the Brazilian beauty, Bieber invited her to an "after party" at his rented home near Rio after the "Believe" concert. Neves admits that she DID share the bed with the singer, but wouldn't confirm if they actually fooled around or had sex.

Here's a video of the non-English interview:

So what do Mstars fans think... did the two actually hook-up?