Looks like not everyone's happy with the budding relationship between Joe Jonas and Gigi Hadid!

Reports claim the new romance was "causing tension" between Joe and Nick!

As the MailOnline reported last week, the stunning 19-year-old Sports Illustrated model actually dated Joe's younger brother Nick Jonas on and off in 2012 and 2013, which could certainly complicate matters between the close siblings.

Indeed, a source close to the brothers tells RadarOnline that tensions are becoming strained as the couple get closer.

'Nick and Gigi dated several times in 2012 and 2013. It was an ongoing thing,' the insider confirms, adding: 'The fact that Joe and Gigi are hanging out now is just strange.'

While 22-year-old Nick has since moved on with girlfriend of one year Olivia Culpo, also 22, and the model went on to date Australian singer Cody Simpson for around 12 months until recently parting ways, that doesn't make matters any better.

But Nick isn't the only person the pair have seemingly rubbed the wrong way, with Joe's recent ex-girlfriend, Blanda Eggenschwiler, said to be livid that her former beau has reportedly hooked up with her friend.

The 29-year-old, who dated Joe for 20 months before calling time on their romance in early August, is actually a close friend of Gigi's and is none too happy about the betrayal.

'Blanda is absolutely furious,' the source tells Radar.

According to the website, the 25-year-old popstar and his new lady love have spent quite a lot of time together in recent weeks, which is certainly evident by their cosy Instagram photos.

'Joe and Gigi have hung out a few times this week actually. They have visited a museum together and even went to the park together on Thursday,' the insider spills.

On September 4, the pair were seen taking a stroll together through Soho, looking relaxed and happy in one another's company.

An insider tells E! News: "Gigi and Joe have been hanging out a lot lately. They have lots in common and she loves how easygoing he is.

"He also has a thing for models. He loves the fashion world and everything attached to it.

"Nick stopped wearing his purity ring right around the same time he started getting hot and heavy with Olivia," a source close to Jonas tellsRadarOnline.com exclusively. "They have a very sexual relationship!"

When The "Who Am I" singer, 22, was asked about the purity ring, he said, "This is a real growth in me and not something I'm doing anymore. But I've got my set of values, things that are important to me now at this point in my life and that's all that matters."

The Jonas Brothers, consisting of 25-year-old Joe, 26-year-old Kevin and Nick, famously wore the purity rings as a sign of chastity when they rose to fame.