Britney Spears' illness forced her to miss her little sister JAMIE LYNN's 13th birthday celebrations at the weekend (03APR04).

The pop superstar scrapped an Illinois concert on Thursday night (01APR04) after being struck down with a viral infection - and the ailment meant she had to stay away from her sister's party too.

The new teen and 13 pals celebrated with proud mum LYNN and ALIAS star Jennifer Garner in Hollywood.

Garner treated the girls to a private viewing of her new film 13 GOING ON 30.

06/04/2004 09:32