Justin Bieber Dating 'Love & Hip-Hop Hollywood' 'Thot' Masika Kalysha!? Sexy 21st Birthday Instagram 'Hook-Up' Exposed After Yung Berg Cheating Scandal [PHOTO]

Justin Bieber finally celebrated his 21st birthday on Sunday (March 1). Apparently, the "As Long As You Love Me" crooner did NOT reunite with on-and-off again girlfriend Selena Gomez for a sexy b-day hook-up. But did the Biebs drunkenly fool around with infamous "Love & Hip-Hop Hollywood" beauty, Masika Kalysha?

As several MstarsNews readers probably remember, Kalyshia was recently deemed the "thot" of VH1 reality stardom. The brunette bombshell indulged in a heated Instagram beef with castmates Hazel-E and Nikki Mudarris back in October - read more on all the crazy drama here. Kalysha was allegedly involved in a whirlwind romance with rapper Yung Berg, but later dumped him for a short-lived fling with boxing champ, Floyd Mayweather.

And now she's moved-on with the young Team Money hypeman?

What!?

Calm down, Beliebers...

The 29-year-old "LHHH" troublemaker shared this viral snapshot on Instagram following the birthday festivites:

masikakalyshia: "Happy 21" (check out the photo HERE).

Several fans immediately freaked-out, and she later deleted the seedy post. But notice, the "mystery man's" tattoo clearly matches Bieber's own shoulder ink:

(Instagram)

Well, well, well... So - what's up with that?

The snapshot shows the "Never Say Never" pop sensation passed-out on Kalyshia's bed, if that truly is Bieber lying face-down after a hard night of partying. Rather off couple, but it's very unlikely that the two are actually dating. Maybe Kalysha just looking for even more cyber attention? Well, it's working... but not exactly in a good way.

Both stars now remain mum on the whole thing. Pretty weird. Sound-off in the comments section below!

Anyway - welcome to legal drinking age, Bieber!

And in other (probably more exciting) JB news, the singer just released a new song with Jack U (aka, the all-star DJ duo Diplo and Skrillex). The remix is entitled "Where Are U Now." So far, most fans are digging it. Check it out: