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Selena Gomez isn't going to like this! And by the looks of it, Kylie Jenner feels guilty about something!

After jetting from Las Vegas to Los Angeles International Airport on Sunday night, Kylie caught an early morning flight at LAX headed to New York City on Monday. When asked about partying with Justin Bieber in Sin City on Saturday night, Kylie had no comment and hid her face.

Justin, 20, and Kylie, 16, hung out after the Floyd Mayweather fight, and it seems like the pop superstar wanted the world to know, as he posted the selfie above. Sure, model Yovanna Ventura was in the shot too, but given how much Kylie and Bieber have been uh, bonding lately, it certainly seems like there's something more than friendship going on between the two!

Selena reportedly had a meltdown when she learned Kylie was texting Bieber behind her back, and last week she unfollowed Kylie and her sister Kendall on Instagram. "Kylie sent sexy pics of herself to Justin and thats what started the fight. Selena saw the pictures on Justins phone and she freaked out and left immediately," a source told HollywoodLife. "Selena flipped out and there was a huge fight between the girls. She now wants nothing to do with Kylie or [her sister] Kendall," another source told Radar.

Still, a different source told Us Weekly that there's no drama. "Selena has no issues with the Jenner girls. They had an issue but they have cleared it up. She has always liked the Jenner girls. They had been fans of Selena since they were young," the insider said. But that was BEFORE Kylie hung with the Biebs in Vegas!

And as far as commenting on her relationship with Bieber, it was the same deal on Sunday night, except Kylie was wearing a short dress (or a very long tee shirt?) and she had a sly smile on her face:

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