The couple, who have been reported to be on the verge of splitting, are still going strong with their six-year-old marriage, reported Ace Showbiz.
Beyonce, 32, and Jay-Z looked happy together at the private party held by the 44-year-old rapper's mother Gloria Carter on July 26.
The intimate bash was held to celebrate the opening of her new restaurant which is called Diamondz N Da Ruff in Newark.
The famous couple arrived at 7 PM and stayed for 15 minutes. The former member of Destiny's Child and her mother-in-law hugged and laughed.