Ariana Grande, Big Sean Dating - Watch Their Steamy Performance of "Best Mistake" at KIISFM Jingle Ball

Ohh-la-la, Ariana Grande and Big Sean stepped up the steamy factor in their relationship as the new couple displayed some pretty serious PDA over the weekend as they took to the stage at the KIISFM Jingle Ball concert. The confirmed lovers seemed like they were in their own personal world as they performed their song, "Best Mistake," during Grande's set at the show.

The singer took to her Twitter account to post about the fun time that she had at the concert writing, "Thank u! @1027KIISFM #iHeartRadio. #jingleball love u."

In the video that was posted of the performance, Grande and Sean finish off the lyrics to the popular song as Sean pulls the singer closer to him and even goes in for a kiss. Grande, not wanting to share the intimate moment with the sold out concert attendees, turns away before leading the singer offstage.

According to E! News, the chemistry between the two was so high that as they left the stage, they shared a quick kiss backstage before Grande joined fellow singer, Jessie J, onstage to sing their hit song, "Bang Bang."

The news site is also reporting that Sean traveled to the concert just to be part of Ariana's set even though he was scheduled to be at another concert on the same night. He split his time between Jingle Balls and Power 106's Cali Christmas, which was held in Inglewood, California.

The couple may have just gone public with their status back in October, but they aren't wasting any time getting comfortable with each other in front of the camera.