Beyonce embarked on her The Mrs Carter Show world tour in April in Serbia and her growing list of demands associated with the world tour has been revealed.

A week after a report revealed that the Houston singer banned European press photographers from taking pictures of her in concert, a source revealed the Halo singer's diva-like demands for her tour rider.

A source told Daily Star Beyonce's strange list of requests. According to the insider, Mrs. Carter requests titanium drinking straws, red toilet paper and hand-carved ice balls to suck on to quench her thirst.

"She's extremely regimented and is taking everything extremely seriously, so she expects her list of demands to be adhered to," said the insider.

The source said that the mother-of-one needs titanium drinking straws so she can drink alkaline water "served at exactly 21 degrees."

Her bathroom expectations include a brand new toilet seat and red toilet paper while the dressing room walls must have a fresh coat of white paint. Beyonce's food requirements include almonds and oatcakes instead of junk food, and only green items. Her staff must wear only 100% pure cotton clothing to reduce the risk of her getting allergic reactions.

"Working so hard and with the toll the travel takes on her body in addition to the intense shows, she feels that her requests aren't too much to ask for as she wants to ensure everything goes to plan," the source explained.

The source revealed that she arrived at her first of six-concert series shows in London's O2 Arena in a private helicopter from her temporary residence in Berkshire. When she arrived at the stadium she declined using the smaller refurbished rooms and instead requested the location's biggest dressing rooms that are usually occupied by sports teams. She refurbished the massive dressing rooms and decorated the older, larger ones with her own furniture including white drapes, leather sofas and rugs.

Watch Beyonce perform Single Ladies (Put A Ring On It) at London's 02 Arena.