Beyonce Knowles has reportedly accused Kim Kardashian of trying to steal the limelight from Jay-Z.
The incident apparently took place at the Budweiser Made In America music festival last weekend, the 42-year-old hip-hop star's other half got upset when Kim, 31, tried to be included in a Ron Howard documentary that was being filmed at the Philadelphia event about the rapper.
An eye-witness told website Radar Online: "Kim was desperate for attention in the VIP area and was getting in the way of cameras that were supposed to be filming Jay-Z.
"She kept saying she was a huge fan of Ron Howard and would do anything to be cast in one of his films, so Kim was using this as an opportunity to impress the movie maverick.
Beyonce, 31, politely reminded Kim that the short wasn't about her, but Jay-Z told her to make peace with the 'Keeping Up With The Kardashians' star - because of his friendship with her boyfriend Kanye West.
They continued: "However, Beyonce wasn't amused that Kim was using her husband's documentary to audition for Ron.
"So, she took Kim to one side and told her that the day wasn't about her, it was about Jay-Z, his work in organizing the event and there were other celebrities and musicians there that needed coverage too.
While Beyonce is said to have made peace with Kim, she apparently was comforted by her mother after the altercation.
The insider added: "Step forward Jay-Z, as gracious as he is, to act as peacemaker. He said to Beyonce that she needs to play nice with Kim because he is pals with Kanye.
"Later that night, Kim phoned her mum Kris to complain about the harsh treatment she thought she got at the festival."