(Reuters) - Madonna has initiated her 13-year-old daughter Lourdes into life as a Material Girl, with the pair collaborating on a fashion line for juniors to be launched in July.

The "Material Girl" collection will be available at Macys and macys.com from late July in time for the new school year, according to a statement on Madonna's website.

The American singer, 51, said she had really enjoyed designing a fashion collection for Swedish fashion chain H&M three years ago but it was her daughter Lourdes, nicknamed Lola, who really wanted to do this collection.

"I've been involved in business meetings, but Lola's really doing the work. I just sit in the corner on my BlackBerry!" Madonna told Us Weekly magazine in an interview to hit the newsstands on Wednesday 31 March.

Madonna said her daughter's style was "inspired by kids she sees in hip-hop and ballet classes, European influences, bands she listens to."

"You could say it's in the DNA -- but I could never tell her how to dress!" said Madonna.

"She also comes to my photo and video shoots, pulls outfits together and gives her input to a lot of my fashion-designer friends. Whether it's Marc Jacobs or Stella McCartney, they always ask her what she thinks."

(Writing by Belinda Goldsmith; Editing by Alex Richardson)