Madonna is reportedly eager to reunite former couple Britney Spears and Justin Timberlake for her upcoming Sweet + Sticky tour.

The Holiday hitmaker has already roped in Spears to film a short cameo which will appear on screens at the shows and has asked the singer to appear in person at some concerts.

And the 49-year-old is allegedly desperate for Timberlake to sing on the tour too, as he recorded tracks on her latest album Hard Candy.

A source tells British newspaper The Sun, "Madonna is always trying to raise the bar and Britney and Timberlake on the same stage would be perfect.

"They have both been asked but I think both are a bit reluctant. Britney would find it all a bit emotional and Jt might not fancy it. More likely is that they both appear on different dates. But if anyone can make this happen it's Madonna."

Spears and Timberlake dated for four years but split up in 2002. Timberlake is currently romancing Hollywood actress Jessica Biel.