Ariana Grande vs. Big Sean Beef, New 'Scream Queens' Boyfriend After Break-Up Drama? 'Selfish & Immature' Ex Sparks Diss Song Revenge

Apparently, things suddenly turned sour between rapper Big Sean and 21-year-old (ex) girlfriend, Ariana Grande. The "Blessings" singer now finds Grande completely "selfish" and "immature," but the former Nickelodeon sweetheart could really care less!

But her ex-beau isn't taking things so lightly...

Sean was supposedly ready to kick Grande to the curb back in February when she ditched his highly-anticipated House of Blues performance in West Hollywood. Several big-name celebrity pals (including Kanye West, Kendall/Kylie Jenner, and Tyga) showed-up, but the "Bang Bang" beauty was allegedly "too busy" preparing for the Grammys to support her man (via TMZ).

And of course, the Detroit emcee wasn't too pleased when Grande "dirty danced" with Justin Bieber during a recent live performance of their hit collaboration, "Love Me Harder" -

So, the young Hollywood couple officially broke-up earlier this month. But the drama continues...

According to a rumored snitch for the popular gossip webloid HollywoodLife.com, Grande will remain focused on her blossoming acting career. But if she finds another lover along the way, then so be it...

"If she finds a guy he will have to be famous and understand her demands and schedule. Right now she is focusing all her attention on Scream Queens and her career," the source explains. "If she is going to hook up with anyone it would most likely be a cast mate... Not to say that anything is brewing, but those are the guys that will be around her for awhile and have the best chance. But to be honest, it's her career that matters now!" 

Grande's new television series "Scream Queens" (also starring Emma Roberts, Jamie Lee Curtis, and Lea Michele) premieres in September 2015.

As for Sean? He's ready to get some heartbreak revenge - through song.

"Big Sean can't wait to put his relationship with Ariana on blast in a song," another HollywoodLife insider reveals.

Well, MstarsNews readers will just have to wait and see what happens!