Parents and health groups are worried about an online virtual fashion game that has got loads of kids logging on.
Miss Bimbo lets players buy their characters clothes with 'bimbo dollars', and even give them plastic surgery or diet pills.
People are worried that girls as young as nine are playing it, and that it could encourage eating disorders.
But the people behind the website say it's not dangerous and it sends out the message that diet pills make you ill.
The aim of the game is to create the most famous and beautiful bimbo in the world.
But bimbo is usually used as a nasty word for someone who isn't very clever and thinks about their looks too much.
And some parents are worried that younger kids playing the game might start admiring their characters, and want to be like them.
Bill Hibberd, from the parents' group Parentkind, said the game could send out a dangerous message to young girls.
He said: "It is one thing if a child recognises it as a silly and stupid game."
Lots of kids are logging on
But he warned some kids might start seeing their character as a cool role model.
And Beat, a group which supports people with eating disorders, warned that the game could make girls think controlling their weight and size was OK.
The people who make the website say that anyone under 13 has to get permission from their parents to register.
They say it teaches kids about the real world, but that they will look into whether they need to change parts of the game.