Justin Bieber Cheated on Selena Gomez with Rihanna? Ridiculous Rumors Claim 'Ongoing Secret Affair' Cut Starlet 'Like a Knife'

Rumors continue to swirl that Selena Gomez recently dumped Justin Bieber because of his seedy cheating ways... and now a shady gossip report suggests that the Biebs' secret ongoing affair with Rihanna is what ultimately cut the "Spring Breakers" starlet's heart "like a knife." According to Life & Style, Gomez allegedly can't forgive Bieber for the raunchy "fling" he had with RiRi back in 2011... and she even has reason to believe that the unlikely duo continued to secretly hook up behind her back. Right...

As reported by Gossip Cop, a recent issue of Life & Style magazine blares the headline:

"Justin humiliates Selena, Affair with Rihanna: How the baby-faced singer seduced music's wildest woman in a hot hotel room... The devastating way Selena found out."

An alleged "inside" source then goes on to explain that news of the affair completely tore Gomez apart inside... and that's why Jelena called it quits back in December - "It was devastating for her. It really cut like a knife because it happened in February of 2011, when Selena and Justin had been dating for months and were falling in love."

Hmm... if that's true, it means that RiRi hooked up with up a 16 YEAR OLD! That's a felony in the state of California...

Gomez's "close pal" then goes on to say that the "Beauty and the Beat" crooner "would never tell anyone he messed around with Rihanna because it would make him look like a dirty dog." And although Gomez forgave him in the past, she supposedly later found out that her boyfriend and the stunning "Diamonds" songstress were still "hooking up all along." The source even speculates that the ongoing trysts most likely occurred at Rihanna's L.A. home "or in a room at the Four Seasons in Beverly Hills, where Justin likes to stay."

Wow, this "friend" sure knows a lot about Bieber's alleged "secret" infidelity...

But the rumors don't stop there. Another supposed source continues, "During breaks, they'd sneak away to the Hotel Giraffe. They were alone - their security made sure of it. Hotel staff blocked off the entire floor for them." RiRi and Bieber even made it a point to see each other and hook up back in November during the Victoria's Secret Fashion Show... but wasn't that the same time rumors began surfacing that Bieber was cheating with model, Barbara Palvin?

Wonder what Chris Brown would think!

Ok, that's enough of that.

Gossip Cop contacted reps for both Rihanna and Bieber, and they both laughed off the cheating claims, insisting that they're definitely false. Life & Style isn't the most reputable tabloid, especially when it comes to "sensationalizing" celebrity gossip, so fans should always take what they read with a grain of salt.

So for now, it definitely doesn't look like Bieber is hooking-up with the much-older Rihanna (FYI: RiRi's younger bro is the same age as the Biebs... so that'd just be weird).