Just two weeks into her sizzling Circus tour, Britney Spears has a sexy surprise for her March 23 return to the Big Apple. “She’ll be singing with Madonna in New York,” the starlet’s stylist David Alexander told In Touch at his March 14 fashion show in LA. So what can we expect from the diva duo? “It will be ‘Get Together’ and ‘Trouble.’ So, together the song is called ‘Lose Control,’ ” David added, signaling a mash-up of hits from both ladies. In addition to joining Britney on the East Coast, the Material Girl may pop by for one of the Circus singer’s LA shows on April 16 or 17. “It’s supposed to be a surprise!” said David. It looks like Madonna is returning the favor to her protégé: Britney delighted fans by performing with the "4 Minutes" songstress during her Sticky & Sweet tour on November 6 in LA. The pop queen seems to already be planning her moves, as she was spotted in the stands at Britney’s March 11 gig in New York’s Nassau Coliseum.