Britney will re-unite with pop legend Madonna at a "Circus" show at the Nassau Coliseum in Long Island New York on March 23rd.
According to new reports, "She'll be singing with Madonna in New York," Britney's stylist David Alexander said to In Touch.
"It will be 'Get Together' and 'Trouble.' So, together the song is called 'Lose Control.'"
Madonna is also rumored to be attending one of Britney's LA shows on April 16 or 17.
"It's supposed to be a surprise!" added David.
UPDATE: According to Britneyspears.com, it's not true:
"Despite rumors otherwise, at the moment Britney has no plans to collaborate with anyone in the near future at any of her upcoming performances.
P.S. David Alexander is not Britney's stylist nor have we ever heard of him."