That's right: blondes supporting blondes! Madonna is joining forces with Britney Spears, and will appear in some of the pop princess' Circus tour dates this summer.

The powers that be are keeping the dates under wraps, so no word yet as to which specific appearances will feature both singers.

"Choreographers have been asked to create an out-of-this-world dance routine for Britney and Madonna. When Britney joined Madonna on stage for her Hard Candy tour it was very sedate. This is going to be a high energy dance routine - getting back to what they are both good at, performing," a source told The Mirror.

My only question is: Can we expect more lesbian kisses between Madonna and Britney, or would that be against Daddy Spears' contract?