With less than two months until the release of the new Smashing Pumpkins album, "Machina/The Machines Of God," there's already turmoil brewing in the band's camp.On Tuesday, Sharon Osbourne announced that she was resigning as manager of the Smashing Pumpkins, effective immediately. And in a tersely worded statement, the wife of Ozzy Osbourne and head of Osbourne Management put the aegis squarely on the Pumpkins' frontman, Billy Corgan. "It was with great pride and enthusiasm that I took on management of the Pumpkins back in October," Osbourne wrote, "but unfortunately I must resign today due to medical reasons -- Billy Corgan was making me sick." Osbourne, whose management company handles Ozzy, Black Sabbath, and Coal Chamber, also noted that she was "saddened that I will no longer be working with such great and talented people as James Iha, Melissa Auf Der Maur, and Jimmy Chamberlin. I wish them much love." The group hired Osbourne Management in October after parting ways with its previous management firm, Q-Prime, in 1998. At the time, the band was said to be unhappy with Q-Prime's handling of its last studio effort, "Adore." The band's reps at Annie Ohayon Media Relations told MTV News that they had "no comment" about the Pumpkins' split with Sharon Osbourne. The Smashing Pumpkins have just launched a European tour to break in some of the new material and will play Milan, Italy on Wednesday evening. "Machina/The Machines Of God" is due out in the U.S. on February 29.