Black Eyed Peas star is reportedly furious with bandmate Fergie - because she is too busy making a movie to go on tour.
The frontman is said to be keen to play a series of gigs to promote the band's forthcoming album, which is due out later this year (08).
But Fergie is currently in Europe shooting the musical movie Nine - and may not be able to guarantee her appearance on a planned tour, according to New York gossip column Page Six.
A source tells the publication, "(Fergie) won't commit to a tour schedule to promote the album." The source adds that shooting Nine is Fergie's "priority right now".