Beyonce Knowles and Jay Z's marriage is allegedly ''crumbling''.

A source close to the pair insists that recent reports about their marriage being in trouble are true and they have more of a business than a romantic relationship right now.

One pal told the New York Post's Page Six: ''Knowing them as I do, obviously there's a little something to certain reports. When your man or your woman isn't getting it done for you, and I'm talking emotionally, not necessarily sexually...they keep things quiet.''

Another insider claims their business relationship between Beyonce, 32, and Jay Z is more important to them than their marriage.

The source said: ''There's still something there, even though it's not going to last. Business is always part of the equation. They know they're the king and queen of hip-hop - and really, all of music. Neither wants to lose that.

''They are solid, solid business people who know what they're doing.''

The report also claims they are having marriage therapy while on their 'On The Run' tour together but Jay Z, 44, prefers to spend his time on his phone.

The source said: ''His phone's constantly ringing. Jay trying to make deal after deal.''