Beyonce and Jay Z
Beyonce and Jay ZReuters

Jay Z and Beyoncé, the most powerful couple in the music industry, are again hit by reports that the two are having marital issues.

According to a new report by Star magazine, the Grammy Award-winning singer is cheating on her rapper husband with her bodyguard Julius De Boer.

Boer was on the elevator when Solange Knowles physically attacked brother-in-law Jay Z after the Met gala.

"Jay definitely thinks that there was and may still be something romantic going on between Bey and Julius," a source told the publication. "He wanted to fire Julius last February, but Beyoncé said, 'Julius isn't going anywhere.'"

"They've spent a lot of time together behind closed doors," the insider continued. "He's even stayed in her hotel room."

Beyoncé and Boer raised eyebrows in 2009, when the 32-year-old singer was photographed leaving a hotel with her mouth covered while his lips appeared to be smeared with red lipstick.

Meanwhile, the couple's six-year-old marriage was under the scanner after the Drunk In Love star's Roman numerals IV tattoo, which she got on her wedding ring finger, to commemorate the day she got married (4 April), Jay Z's birthday (4 December) and her own (4 September), appeared to be fading pretty quickly.

"To the public, Beyonce and Jay Z appear to have it all. But behind close doors, they're not as happy as people think they are," a source close to Jay Z told Radar Online.

The insider added: "Jay's been telling his friends that Beyonce is getting her ring tattoo removed, the one they got when they were married. He just sorta shrugs it off though saying 'Nothing is forever.'"