Justin Bieber Kylie Jenner Hit The Floyd Mayweather Fight; Selena Gomez Instagram Collage Mocks It; Did Justin Bieber and Kylie Jenner Have an Affair Last Year?

Justin Bieber and Kylie Jenner dating? It looked that way over the weekend when the pair hit Vegas. The Justin Bieber and Kylie Jenner love story isn't lost on Selena Gomez.

After Justin Bieber posed for a selfie with Kylie Jenner after the Floyd Mayweather fight in Las Vegas Selena Gomez Instagrammed a collage of John Legend's music video for 'All Of Me' which features his wife, Chrissy Teigen, in what looks like a comment on Justin Bieber's date with Kylie Jenner on May 3!

After the Floyd Mayweather fight with Marcos Maidana on Saturday night, Justin Bieber and Kylie Jenner posed for an Instagram selfie. Captioned "Mayweather," the shot show Kylie wearing a lace mini dress and getting cozy at the MGM Grand Garden Arena.

Kylie Jenner stayed in a good mood all the way back to Los Angeles where she was photographed at the airport with a bunch of friends on Sunday.

Reports say Justin has been spending a lot of time with both Kylie and her sister, Kendall, and that it's been bothering Selena Gomez, who unfriended the whole bunch two weeks ago.

A source told E! News Bieber cheated on Selena with Kylie this spring. Bieber also took a selfie with a young Miami model named Ventura.

Last week, Gomez mysteriously unfollowed everyone she'd been following on Instagram and posted a few cryptic photos. Gomez fired her parents as her managers and reportedly hired Katy Perry's and Adam Lambert's music manager. This week the media is flooded with news about Selena Gomez's alleged hook up with the much older Orlando Bloom. Gossip zines are speculating that it is a plan to get back at her ex- boyfriend Justin Bieber.