Britney Spears is planning to unveil superstar pal Madonna as a surprise guest when she kicks off her comeback tour next year (09).
Spears joined Madonna onstage in Los Angeles last month (Nov08) during the U.S. leg of her Sticky + Sweet tour - and Spears wants Madonna to return the favour when she hits the road in New Orleans, Louisiana in March (09).
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."