Hundreds of girls turned up to audition for the coveted part in London last weekend after Warner Brothers bosses called for an open audition. However, Madonna was not going to let her daughter, also known as Lola, be among them.
An insider is quoted in The Daily Star as saying: "Lola printed off all the information and showed it to her mum. She's convinced she has the other-worldly qualities Warner Brothers are looking for.
"But Madonna pointed out they're looking for girls aged between 13 and 16, so she is much too young."
The source added: "Lola had a massive sulk and complained that producers would overlook her age because she looks and acts much older than her years."
Madonna has previously commented that she thinks Lourdes will follow in her musical footsteps but that she wants the girl to make up her own mind when she is older.