Pop Queen Madonna is not in a happy mood these days and the cause of her unhappiness is her teenage daughter Lourdes. According to sources the 15-year-old, known for her ever-changing style, has recently shaved off part of her hair which angered the celebrity mom. However, the singer is an admirer of her kids style otherwise and also takes fashion advice from her. ''My daughter has a very strong opinion and she knows what she likes. She has a good sense of style and I like the way she dresses. Sometimes we disagree on things. I don't like that she shaves her head, but she likes it, Madonna said. ''Often it's fun to collaborate with her and I can always look at her and say, 'Does this look OK? Is this good? No? Shoes? No? High waisted, low waisted? She's a pretty good judge and very critical,'' she added.