Madonna & Britney Planning High-Energy Routine For Circus Tour

Madonna is reportedly planning an energetic dance routine for her appearance on Britney Spears 'Circus' tour this year.

The pop veteran is said to be joining the 'Womanizer' singer as a special guest, after Britney performed with Madonna in Los Angeles last November.

"When Britney joined Madonna on stage for her Sticky + Sweet tour it was very sedate." a source tells British newspaper the Daily Mail.

"This is going to be a high-energy dance routine - getting back to what they are both good at: Performing."

Spears has hired Jamie King for the tour - the same choreographer the Queen Of Pop has used on her last three tours.