Justin Bieber ‘Cheated’ On Selena Gomez With Fan Or Just Tabloid ‘Cheated’?

Justin Bieber is accused of cheating on Selena Gomez with a fan at the South by Southwest festival (SXSW), after reuniting over a whirlwind weekend with Gomez before she flew on to NYC to film an adidas NEO commercial on March 11.

The cheating claim comes via — ahem — Star magazine citing inevitably unnamed sources, like the kind currently being quoted in the newly recycled and likely equally dubious “Bieber flirts with Miley Cyrus” rumors.

Back to Star. The magazine alleges Justin met an unidentified fan at SXSW and just couldn’t say no.

“He couldn’t resist,” says a purported ‘source.’

Now, apparently Selena’s friends are worried Justin’s alleged cheating will send her straight back to rehab. Gomez checked into Dawn at Arizona in January over difficulties “letting go” of her relationship with Bieber, according to an insider previously quoted by E! News.

“It’s a toxic and dangerous situation,” Star’s alleged ‘source’ went on to say of Justin and Selena’s relationship.

Oddly, Selena seemed perfectly happy as she received a hearty reception to her “Stay true to who you are” speech to thousands of kids at the We Day conference in California just two weeks ago.

During her speech, the 21-year-old opened up about the pressures of fame and may have hinted about her decision to reunite with Bieber in Texas and not listen to those around her who may be against it.

“Until recently I had given into that pressure, I lost sight of who I was,” Selena told the crowd.

“I listened to opinions of people and I tried to change who I am because I thought others would accept me for it. And I realized I don’t know how to be anything but myself.”

Bearing in mind that Star magazine’s report – if two unattributed quotes can be called that – gives the impression that Gomez knows about Bieber’s alleged cheating with a fan at SXSW, the actress-singer also looked remarkably happy celebrating the 16th birthday of Christian “King” Combs at 1OAK in Los Angeles on Friday.

Other names at Sean “Diddy” Combs’ son’s birthday were Khloe Kardashian, Kendall and Kylie Jenner, and Willow Smith.

Gomez and the Jenners posted Instagram snaps from the bash.

Selena Gomez Parties With Kylie, Kendall Jenner And Christian 'King' Combs

(Photo via Instagram: Gomez, Combs and the Jenners at 1OAK nightclub, Friday, April 4.)

Selena Gomez Parties With Kylie and Kendall Jenner and Christian 'King' Combs

(Photo via Instagram: Gomez Snuggles With Kylie Jenner while sister Kendall and and Christian ‘King’ Combs photobomb.)

We have to say we’re having trouble believing Star’s claim that Bieber allegedly cheated on Gomez, mostly because the tabloid habitually gets its facts wrong.

Earlier this month, Star magazine claimed Justin and Selena were “planning a joint tour” in the hopes of “spending quality time together” and “hitting the road” to “repair their battered images.”

The joint tour claim was swiftly denied by Gossip Cop. The outlet verified the rumor was “100 percent untrue.”

It’s not the first time Star has made dubious claims about Bieber and Gomez.

Back in November 2012 when the couple first split after dating for two years, Star mistakenly pointed fingers at the Disney alum and accused her of cheating.

The magazine also published the “exclusive” second bogus Bieber paternity claim last May.

While Gomez is currently in Los Angeles, Bieber has returned to Miami, Florida, where he has been working with Austin Mahone.

Justin has reportedly rented five suites in a hotel ahead of his trial on May 5 on charges of DUI and related.

However, Miami prosecutors and Bieber’s lawyers are said to be close to agreeing a plea deal.