Pop star Joss Stone amazingly headbutted her brother as a family baptism descended into an ugly brawl.

The diva, 21, was to be godmother to half-brother Daniel Skillin's year-old son Louis but incensed her family by arriving 30 minutes late.

She then refused to properly read out the church order of service – and as elderly relatives confronted her she branded them "old biddies".

When ex-heroin addict and jailbird Daniel, 29, later quizzed her, she turned violent. One guest revealed: "She was absolutely furious and they had a full-blown argument. They were screaming at each other and the next thing, Joss headbutted him.

"Other family members ran over to break it up and she stormed off.

"It turned from a nice family affair into a brawl between Joss and her brother. No one could believe it."

Joss blamed traffic for being late at St George's Church in Taunton, Somerset. But the guest said: "You would think as the kid's godmother she'd be on time. And as she recited the order of service, she failed to read what she was given.

"It showed lack of respect to the family.

"The priest had to remind her of her responsibilities as a godparent and tell her to answer from the sheet. It was embarrassing to see her mumble the wrong words. A couple of relatives were not happy and told her so afterwards. But Joss said she wouldn't 'take abuse off a bunch of old biddies'."

Rev John Cunningham later confirmed he had reminded her a bout the reading but said: "The conversation I had is between me and her." The ugly bust-up exploded after guests decamped to Daniel's home.

However, her pals insisted Joss's headbutt was little more than a tap.

One friend said: "She had been looking forward to the baptism.

"No one seemed bothered that she was a little late but a few people from Daniel's side had a go.

"At Daniel's house she got lots of stick and eventually had a go back.

"But she didn't want trouble and when things got a bit too heated she left. She was really upset."

Joss has has a rocky relationship with Daniel. But she backed his drugs battle and recently told him: "I love you, don't go anywhere ever again because I missed you."

We don't know much about Joss Stone, other than she's so pigment-defyingly soulful that if she and Robin Thicke were to collaborate on a baby we're pretty Barry White would pop out. But we never would have expected her to cause a ruckus at a baptism. In the British crooner world, that's more of a Charlotte Church move. Only Charlotte probably would have flashed her boobs before calling the baby a wanker.

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