Madonna's seven-year-old son DJed at her gig?the night before(10.10.12).

David - the singer's adopted child with ex-husband Guy Ritchie - joined his elder sister Lourdes, 15, and Martin Solveig in the onstage DJ booth at his mother's 'MDNA' show at Los Angeles' Staples Center.

The little boy was also spotted rocking out as Madonna performed to a star-studded audience which included Jessica Alba, Rose McGowan, Emma Roberts, David Arquette and Robyn.

In August, Madonna revealed she had cancelled the Australian leg of her world tour as she felt it would be unfair on her kids, Lourdes, David, Rocco, 12, and seven-year-old Mercy, to be so far away.

In a YouTube video apology to her Australian fans, Madonna said: "I am really and truly sorry to have disappointed you and that's something I don't feel very good about.

"I know the last time I was on tour I missed Australia as well.

"My children are my first priority and because they are older I can't take them with me on the road everywhere.

"I really feel I would be an irresponsible parent if I didn't stop my tour and spent time with them. My daughter is going to be leaving home soon."