19-year-old LA based model Cailin Russo got steamy and heavy with Justin Bieber in his latest "All that Matters" music video that may have rubbed his ex-girlfriend Selena Gomez the wrong way. The blonde beauty claimed that Selena dissed her in an Instagram post after Justin's ex-girlfriend saw his hot on-camera snuggle with the vixen.

Selena posted a selfie on Instagram with the caption "I thought he only liked the Latina category. Smh... #nomakeup #hatewhengirlssaythat." Cailin told Cosmopolitan magazine that Selena's post was clearly directed at Justin with her in the video and added she "was just doing [her] job."

Cailin said Selena is a superstar and that she's just a girl in a video. "She's his ex-girlfriend and I'm sure they still have feelings for each other," she added. While Cailin says she has a boyfriend, she talked about how it was locking lips with the teen heartthrob. She said it was "kind of weird" because she has never kissed anyone on set with someone famous or even that passionately.

She dished that kissing Justin was nice and it helped that he smelled really nice, like cologne and the singer's breath was fresh all day. Despite the star's edgy reputation, Cailin found Justin to be a gentleman. "He was humble. He didn't try to be all flashy and wasn't like check out my guns or six pack," she said. "Justin was down to earth and was nice to everyone."

Cailin said she got butterflies even days after the shoot. It felt surreal for her and even got a speeding ticket after the shoot because she was on a high. Justin has kept in touch with her since the shoot, Facetiming and texting her. Russo assured that Selena has nothing to worry about, though, because she and Justin are just friends. "We're hommies. We hang out when he's around and I would love to write music with him someday," she said.

Cailin has stored Justin's number under an alias in her phone because she doesn't want anyone to see if he texts or Facetimes her. That makes us wonder they are flirting and if Selena doesn't really need to worry! Check out Justin Bieber's "All That Matters" video below and tell us what you think!

Source: YouTube.com/JustinBieberVEVO