Madonna?and Janet Jackson?are working on a tribute to Janet's late brother Michael Jackson after bonding over dinner after Sunday's MTV Video Music Awards (VMAs), which saw the "Together Again" star perform "Scream", a track originally recorded with her sibling, and Madonna make a tearful speech about her regret at "abandoning" the pop icon before his death.

A source said: "It was a meeting of two great musical minds. Madonna was so impressed with Janet's tribute to Michael that they started talking about how great it would be to honour him by doing something together.

"With that one performance Janet proved she's back on top of her game. And who better to join forces with than Madonna?

"There was definitely something very interesting being planned between them."

Speaking at the awards ceremony, which was held in New York, Madonna admitted she was only attending the bash to pay her respects to Michael.

She told Britain's Daily Mirror newspaper: "Now I've finally had chance to say farewell to my dear friend. I can now say I have paid my respects to Michael. That's why I'm here. To say goodbye.

"And Janet's performance was amazing - just the perfect tribute to her brother."

Madonna's manager Guy Oseary recently revealed that the "4 Minutes" singer had hoped to join Michael on stage during his "This Is It" London residency.

He wrote on Twitter: "A month ago, Madonna told me she wanted to do a surprise performance at one of Michael Jackson's UK shows."

Meanwhile, Madonna is already planning a stint in the spotlight for adopted daughter Mercy, four.

She said: "I adore Mercy, she's such a sweet child. She's doing so well. Hopefully when she's older she can be in my videos like the others. She could have some moves. Who knows?"