Jay Z
Jay Z has been romantically linked to Nicole Scherzinger. Reuters

Jay Z has been accused of cheating on Beyoncé with Nicole Scherzinger, according to a gossip site.

The rap mogul, who has been married to Queen B since 2008, is rumoured to have had a fling with the former X Factor judge while the power couple were engaged. He has not commented on the claims.

The sensational claims first surfaced on gossip blog Crazy Days and Nights on its Blind Items Revealed segment just days after it emerged that former Pussy Cat Dolls star's romance with F1 star Lewis Hamilton had once again hit the rocks.

"Before there was Lewis Hamilton there was this A+ list rapper/producer/everything else who was engaged at the time but made sure our female celebrity/singer was well taken care of," the post read.

"Nicole Scherzinger/Jay-Z".

While some fans claimed that the site was simply trying to stir up controversy, others were convinced that the 99 Problems hitmaker had strayed.

"Nicole is so bitter now it wouldn't surprise me if she writes a tell-all. She thought she was gonna be big after the Pussy Cat Dolls," one wrote.

Another said: "Don't believe it. I smell a rat"

A third commentator added: "Who hasn't he taken care of?"

This is not the first time Jay Z and Beyoncé's marriage have been hit with rumours of infidelity.

In August 2013, rising female rapper LIV claimed that the hip-hop star, who fathered two-year-old daughter Blue Ivy with Beyoncé, made a move on her in a club and tried to make her his mistress.

"For the most part, Jay hit me on some, 'I'll hit you when I'm in town' while he is married to Beyoncé," she told PNC Radio.

"For me, I'm not that chick. I could do a lot of things but [choose not to.]"