British soul singer Joss Stone reportedly headbutted her brother at a recent family baptism.
The star, 21, was to be godmother to her 29-year-old half-brother Daniel Skillin's son Louis at a ceremony in Somerset, England.
But Stone allegedly upset guests by arriving 30 minutes late - and is then said to have attacked Skillin when he confronted her over her behaviour.
A source tells British newspaper the Daily Mirror, "She was absolutely furious and had a full-blown argument. They were screaming at each other and the next thing, Joss headbutted him."