Britney Spears is planning to unveil superstar pal Madonna as a surprise guest when she kicks off her comeback tour next year.

Spears joined Madonna onstage in Los Angeles last month during the U.S. leg of her Sticky & Sweet tour - and Spears wants Madonna to return the favor when she hits the road in New Orleans, Louisiana in March.

The singer's choreographer Wade Robson reveals, "I'm choreographing and set-designing her show. There's been talk of Madonna making an appearance, and there's so many places we could take that. At this point the main issue is timing."

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(This news article provided by World Entertainment News Network)