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Well, Brit joined Madonna for her Sticky & Sweet show here in Hollywood, so it only makes sense that the queen of pop would return the favor!

According to The Daily Mirror, Madonna will share the stage with Britney for a few of her Circus tour dates this summer, and in addition to her extra Sticky & Sweet concerts, the material girl may even be adding the Glastonbury festival on to her lineup as well.

Though no official confirmation has been released, a source for the newspaper said, "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 [Sticky & Sweet] 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."

These two go way back, so we're not surprised!