The 51-year-old singer - who recently launched teen clothing range, Material Girl, with 13-year-old Lourdes - often steals her daughter's style.
When asked if she ever takes clothes from her mother's wardrobe, Lourdes said: 'Oh my God. Like....all the time! But she does the same thing to me now. But it's so annoying, like, like, because my feet skipped her shoe size, and it's so frustrating.'
Meanwhile, the 'Celebration' hitmaker revealed that she loved working with Lourdes, but admitted they didn't always agree on everything.
Speaking about her daughter, Madonna said: 'I think we complement each other but we do disagree on a few things. I wouldn't have worn this flannel shirt thing but she looks good in it so what are you going to do. I'm a very proud mum tonight.'
Lourdes agreed, telling the Daily Mail newspaper: 'Yes there were definitely clashes but you know it all worked out in the end.'
The collection - modelled by 'Gossip Girl' star Taylor Momsen and available to buy at US store Macy's - consists of clothes, footwear, handbags, jewellery and accessories.