Big Sean Disses Ariana Grande On Twitter, Sparks Justin Bieber Cheating Scandal? 'Love Me Harder' Grinding 'Wows' Boyfriend, Prompts Break-Up? [WATCH]

Although Ariana Grande only has eyes for boyfriend Big Sean, the "Break Free" songstress definitely shares some intense onstage chemistry with fellow pop sensation, Justin Bieber! Wonder if that makes the "Blessings" emcee jealous at all?

During Grande's concert in Los Angeles on Wednesday (April 8), the Biebs made a surprise appearance for yet another epic "Love Me Harder" duet. Things got rather passionate - and even a bit frisky!

Apparently, the two singers are just really close friends and business associates. But still... the performance got a bit touchy-feely. Does 27-year-old Sean have a reason to worry?

After several fan-made videos from the concert started going viral online, the Hall of Fame superstar allegedly tweeted (before deleting the post):

@BigSean: "Wow" (via MediaTakeOut.com).

So - is that a good "wow," or a bad "wow?" If it wasn't such a big deal, why was the tweet eventually taken down?

He also later tweeted:

@BigSean: "so many times in my life I wish I could of been at 2 places at once."

Maybe to keep Selena Gomez's ex in his place? The Roc Nation rapper is currently touring in Europe and Canada, while Grande continues grinding on Bieber in LA...

Twitter's going crazy, and another deleted tweet (probably fake) is now blowing-up on the popular social networking site:

@BigSean: "This kid is about to learn not to touch my girl like that. Beliebe that."

Ha.

Still, the Dark Sky Paradise emcee's relationship with the former Nickelodeon sweetheart seems to be going extremely well. Her onstage flirtation with the "As Long As You Love Me" crooner is all just for show, right?

But several months ago, MstarsNews did report that 21-year-old Grande did want more dating "freedom" now that she's made it big in Hollywood. An alleged Dish Nation "snitch" revealed this lengthy insider's scoop back in January:

"Ariana told their friends she's not even thinking of marriage yet. She's very happy in her relationship with Big Sean and loves him very dearly. They are soul mates and do everything together... But she's still so young. She said to her friends that's there's still much more for her to see in the world. She wants to go traveling, not stop in countries for one night for tours, but properly explore like any young person wants to do... She still feels like she has to live a little-and doesn't want to be tied down in a marriage, have kids, or do anything like that for a while. Obviously, that left Big Sean a little upset-and he's just wondering if Ariana feels the same as he does... He's [smitten] with her, they grew up with each other and their relationship is built upon a deep affection for one another... He just would like to know if they're on the same page, and if perhaps wedding bells are in their future."

Will their relationship survive amid the growing fame?