Madonna has invited Sienna Miller to lunch so they can complain about other women.

The '4 Minutes' singer sympathises with the 27-year-old actress following her recent complaints that she is "at war" with her fellow sex and wants to meet her in New York to offer her support.

The 50-year-old pop star also wants Sienna to meet her 12-year-old daughter Lourdes so she can quiz her on how to make it as an actress.

A source said: "Madonna's keen to meet up with Sienna and she also wants to introduce her to Lourdes, who is studying drama. Sienna can give her some acting tips."

The 'Factory Girl' star - who faced a backlash from her female fans after she began dating married actor Balthazar Getty - recently said other girls make her life hard.

She moaned: "I've been at war, without a doubt. I have really experienced the judgment of women in the past year. It's women who are holding us back.

It's women who are judging. I find it sad. We say we want to be on an equal path, but men don't sit around b***hing at each other. It's very competitive. There's no sisterhood."