Zellweger concerned at effects of diets on fertility

Hollywood beauty Renee Zellweger fears her yo-yo dieting for the Bridget Jones movies will threaten her chances of getting pregnant.

The actress is reportedly keen to have a child with her rocker boyfriend Jack White, but is concerned she may have affected her fertility by gaining a staggering nine kilograms (20 pounds) for Bridget Jones' Diary in 2001, losing it for Chicago and piling it back on for Bridget Jones' The Edge of Reason.