Madonna has banned her boyfriend from answering his phone in front of her.
The 50-year-old singer argued with lover Jesus Luz, 22, after he took a call while she was in the same room, and has now restricted him to accepting emergency calls only.
A source said: "She just turned on him. She told him it was rude for him to take a phone call in front of her. He stood up for himself and they had quite a heated argument.
"Madonna agreed to let him answer the mobile when she's around, but only in emergencies.
"His family claims they always know when he's with her because they can't get him on the phone. And it's true. He'll see his phone ringing and he just has to let it go."
However, Madonna allows herself to chat away on her phone whenever she wants.
The source added to Britain's Daily Mail newspaper: "If her phone rings and she wants to take the call, she'll do it. This is not a relationship of equals."
Jesus was spotted cavorting with a young model called Luciana in his hometown of Rio de Janeiro last week (14.03.09), while Madonna was at home in New York.
An onlooker said: "Jesus was the hit of the party and all the girls went wild for him when he arrived. But Luciana was more interested than most and soon got hold of him for a dance.
"He whispered things in her ear, grabbed her hand, put his hand around her waist."