Handout shows Canadian pop singer Justin Bieber in police custody in Miami Beach, Florida
Canadian pop singer Justin Bieber is pictured in police custody in Miami Beach, Florida January 23, 2014 in this Miami Beach Police Department handout released to Reuters on March 4, 2014. Bieber was charged with driving under the influence, resisting arrest and using an expired license after Miami Beach police say they caught him drag racing on January 23. Bieber pleaded not guilty to the charges. REUTERS/Miami Beach Police Dep

The youngest of the Kardashians is having a blast in Vegas when she was spotted at the Floyd Mayweather-Marcus Maidana fight with the one and only Justin Bieber. The reality star is reportedly going out with the Canadian singer as both parties did not confirm or deny their relationship.

Together with a gaggle of friends, the 16-year-old beauty kept her high spirit as she returned to L.A. and looked super cool in a cobalt-blue sports jacket over a loose black T-shirt. With her black boots and tinted round shades, she strutted in the airport as the staff helped her with her luggage.

Clearly, Justin Bieber moved on from estranged girlfriend Selena Gomez as he started hanging out with the Kardashian. The "Boyfriend" singer even posted their selfie on Instagram as they both attended the big boxing event in Las Vegas on May 3.

Although Mayweather dominated the fight, Justin and Kylie dominated the entire evening as the two snuggled up for a selfie. The controversial selfie features the "Baby" singer with shades and his usual hair flip with a third wheel, who appears to be the 18-year-old model Yovanna Ventura.

The star vowed everyone, including Justin, with her sexy lace playsuit that features an intricate design over a gold under-layer. She teamed her lacy outfit with a simple heeled sandals and used several gold bracelets for accessory.

If hanging with the reality star did not piss the "Come & Get It" singer, their selfie will surely make her jealous that Justin already moved on after she dumped him following Coachella weekend - that is what reports are claiming.

"Selena had found sexy photos of both Kylie and Kendall Jenner on Justin's phone and she also learned that Kylie and Justin had made out," says a source to Hollywoodlife.com.

Although the former Disney star is not holding any grudge againt Kylie, she "unfollowed" her and her sister Kendall on Instagram.

"She's not going to hold this against Kendall or Kylie because it's Justin that's really to blame. He's the one that made her promises, not Kendall or Kylie. Selena is putting all the blame on Justin," says a source.