Beyonce Knowles and Shawn "Jay-Z" Carter reportedly had the "biggest fight of their marriage" over a party which the hip-hop mogul threw in London for his long-time manager Ty Ty's 40th birthday on Saturday night.
The 30-year-old new mother refused to attend the star studded event after learning that Kim Kardashian, who is dating Jay-Z's good friend Kanye West, was attending, which reportedly "hurt" Jay-Z, according to Media Take Out.
"Beyonce didn't want to go when she learned that Kim [Kardashian] would be there. She asked [Jay Z] to uninvite [Kim]. But [Jay] was like, 'That's Kanye's guest, and I can't uninvite her,'" a source told MTO.
"Jay was upset and hurt. That's his best friend in the world, TyTy [and his family] vacation with [Jay and Bey] . . . and he's the godfather to Blue. . . [Jay Z] thought it was disrespectful for [Beyonce] to not attend just because of [Kim]," the source added.
The event was held at a top city venue after Jay-Z and Kanye's O2 show, and while guests included Beyonce's good friend Gwyneth Paltrow and singer Rihanna, Beyonce did not attend and was reportedly spotted in Atlantic City the same night where she has an upcoming Memorial Day show.
Kardashian, a reality TV personality, reportedly asked West to take her to the big event and he obliged, which did not sit well with Beyonce.
The news follows recent reports that the "Love On Top" singer banned Kardashian from mingling amongst her inner circle after learning about her new found romance with West, 34.
"[Beyonce] wasted no time in banning Kim from being invited into their inner circle, which is exclusive to say the least. Beyoncé is used to hanging out with Chris Martin and Gwyneth Paltrow- she's in a totally different league," a source told Heat Magazine.
Kardashian, who is still legally married to NBA star Kris Humphries, is already said to be in discussions about marriage with West and the pair are said to be getting more serious but Beyonce has made it clear that she wants no part of it.
"Beyoncé doesn't want the kind of celebrity that Kim Kardashian has nailed down as her own thing. Beyoncé doesn't want to bring that reality show infamy and drama into a personal life that Beyoncé has tried to keep close to her," a source told Hollywood Life.
"The Beyoncé the world knows and the Beyoncé [and] Jay-Z that her close friends know are completely different and she wants to keep it that way," the source added.