Ariana Grande’s Boyfriend Big Sean Goes WILD With Jealousy Over Justin Bieber’s Flirty Antics; Threatens Canadian Pop Star For Being Too Affectionate?

By Staff Reporter

Apr 09, 2015 03:36 PM EDT

On Wednesday night, Ariana Grande got another surprise appearance from Justin Bieber during her concert at the Forum in L.A. However, things a little bit awkward when the 21-year-old Canadian crooner flirted with the "Break Free" hit maker.

Ariana Grande, 21, and Justin Bieber definitely set the stage on fire Wednesday as they treated fans with another performance of "Love Me Harder." Just a few days ago, we reported that Bieber previously made a surprise appearance in Grande's March 28 Miami concert. However, fans were shocked when Bieber forgot the lyrics of the same song during their duet.

And while the surprise performance earned loud cheers from the fans, Grande's boyfriend Big Sean was reportedly unhappy about Bieber's flirty moves. According to TMZ, Bieber got too handsy toward the end of the song, "As Long As You Love Me," when he called Grande over to stand in front of him and threw his arms around her.

The action apparently made Ariana Grande uncomfortable as she quickly disentangled herself from Justin Bieber. The incident also made Ari's current beau Big Sean to tweet (and later deleted) what appeared to be a warning to the "Beauty and the Beat" singer.

"This kid is about to learn not to touch my girl like that. Beliebe that," the rapper reportedly tweeted. However, Big Sean's rep denied the tweet and told E! News it was fake.

Meanwhile, aside from the their "Love Me Harder" and "As Long As You Love Me" duets, Bieber also stayed a bit longer and sang his single, "Where Are You Now," MTV noted.

Even though Ariana Grande and Justin Bieber appeared to have some undeniable chemistry, their relationship is simply platonic since Ari has a boyfriend, Big Sean. And while Justin is single, he's not ready for another relationship yet.

"Well, at this point in my life I'm so focused on myself that I'm not looking for a girlfriend," Bieber recently told USA Today. "I'm just trying to make sure I'm 100 percent so I can add to the person I want to be with."

So, what do you think of Ariana Grande and Justin Bieber's performance? Did Bieber cross the line for being too affectionate causing Ari's beau Big Sean to get jealous? Watch the clips below.