Beyonce Knowles and Jay Z will reportedly renew their vows in April.

The couple are thought to have said "I do" again in 2012, when they celebrated their fourth anniversary.

On April 4 this year they will be celebrating six years together and apparently the date 04.04.14 is particularly special to them as they are said to be "obsessed" with the number four.

"Beyonce and Jay Z are more in love than ever and, as the number four is their lucky number, they want to mark this year and make it special," a source told British magazine Star.

"On 4 April - their anniversary - they want to have a small commitment ceremony in the garden of their mansion in Scarsdale, New York."

The pair married in private in 2008 and welcomed their daughter Blue Ivy in January 2012.

She might only be two years old, but the little one is thought to be involved in the upcoming ceremony.

"Around 30 family and close friends will be present. Blue Ivy is only two so she's too young to understand, but they're hoping she could present them with commitment rings on a pillow. It will really cement them as a family," the insider continued.

"No expense will be spared. They think it's important to celebrate when things are going well. There will be free-flowing champagne, and music and dancing, with the celebration moving on to Jay's 40/40 Club. After that, they have a Caribbean yacht cruise planned for four days."

Beyonce and Jay Z performed together at the Grammy Awards last month and looked more loved up than ever while on stage.