Selena Gomez for surprised Justin Bieber

Selena Gomez & The Scene during the opening night at concert.

Coming on stage and give him a big hug from Selena surprised Justin Bieber.

He also serenaded the audience with Justin Timberlake’s “Favorite Girl”.

Selena had some support from other celebs like Bella Thorne and Emily Osment.

Justin telling the audience "give it up for Selena Gomez" by the end of their surprise.

Here’s the video clip.