The couple's romance has been rumoured for six years
A licence confirming the marriage of Beyonce and Jay-Z has been filed with the authorities in New York, an official has said.
The couple held a lavish party in Manhattan earlier this month, but have refused to confirm that they were celebrating their nuptials.
Donna Conkling, a clerk in the suburb of Scarsdale, said the licence had been received by their offices.
The pair have not publicly acknowledged their liaison, dating back to 2002.
Ms Conkling also confirmed the licence had been signed by the official conducting the ceremony.
The celebration, which took place at Jay-Z's apartment on 4 April, was attended by actress Gwyneth Paltrow and Destiny's Child stars Kelly Rowland and Michelle Williams, according to US media reports.
White flowers and silver candelabras were delivered to the building in New York's Tribeca district, while a white tent was set up on the roof.
Knowles, 26, and 38-year-old Jay-Z - real name Shawn Carter - have collaborated musically on singles such as Deja Vu, '03 Bonnie and Clyde and Crazy In Love.
It was recently reported that Jay-Z was in talks with concert promoter Live Nation over a proposed $100m (£50.1m) deal which would cover recording, publishing, live shows and other rights.
He was president of hip-hop record label Def Jam until he stepped down in December, and will headline the Glastonbury festival this summer.