Justin Bieber's new crush may be making his ex-girlfriend a bit jealous.

Cailin Russo got steamy making out with the 19-year-old Canadian in his new All That Matters music video, which dropped Monday. He also posted a photo of the blonde model kissing him on the cheek in late November.

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Bieber's ex, Selena Gomez, shared a selfie on Instagram on Nov. 30 with the caption, "I thought he only liked the Latina category. Smh... #nomakeup #hatewhengirlssaythat," and Russo thinks the note was intentionally aimed at her.

"It was clearly directed at him with me in the video, but like I said I was just doing my job," the model said in a new interview with Cosmopolitan. "Selena is a superstar and I'm just a girl in a video. She's his ex, and I'm sure they still have feelings for each other."

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However, anyone interested in dating the Boyfriend singer may have cause to be jealous. The 19-year-old video vixen revealed she is still in close communication with Bieber, and that the singer is even stored in Russo's phone under an alias.

"If my phone is out and I'm with people, I don't want anyone to see if he texts me or FaceTimes me, ya know?" she said.

Russo also admitted she have a boyfriend -- for now.

"I had a boyfriend up until the video and the drop," she continued. "We broke up for about a week after, but we're back together... for now."

Russo then talking about shooting passionate kissing scenes with Bieber throughout the music video and how she was left on "such a high" afterwards.

"In the beginning it was kind of weird because I had never kissed anyone on set that passionately or that famous," she said. "I wasn't a super fan of his before I did this and I just kept thinking to myself that people would kill to do this. I got butterflies and I do still to this day. After the shoot wrapped it felt so surreal, I even got a speeding ticket after the shoot because I was on such a high. I guess you could say I wouldn't mind doing it again."

Tags: Selena Gomez Justin Bieber