Credit: Bruja/Rachid Ait, Photo: Justin Bieber Makes Out With a Girl for Music Video

Yes, the love of your life, Justin Bieber, was seen making out with a girl other than his one and only, Selena Gomez. But before you tear up all of your "Mrs. Bieber" posters and label him a cheater, let's take a closer look.

While filming his new music video for "Boyfriend" in LA on Saturday (April 21), the heartthrob singer had no choice but to kiss and grope a sexy brunette, who just so happened to be wearing a belly shirt and short-shorts — it was all for the art of the video, c'mon!

It was obvious from Justin's boyish giggles and wandering hands that he didn't enjoy the make-out sesh whatsoever, so who better to save him than his IRL girlfriend, Selena Gomez? That's right, ladies, SelGo made an appearance on-set (photos below), where she quickly straddled the Biebs and gave him passionate kisses.

Take that, unnamed brunette chick!

Follow Alissa Kombert on Twitter @AyeKayArt.

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Credit: Bruja/Rachid Ait, Photo: Justin Bieber and Selena Gomez on Set of the "Boyfriend" Music Video in LA on April 21, 2012