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The track 'My Love Is Better' featured backing vocals from the British pop band, who were unhappy with producer/writer Brian Higgins for using them on his collaboration with Annie.
"The girls can't believe Brian didn't let them know first," a source told Teletext.
"Basing a song for another artist around the girls' demo vocals is cheeky of him, to put it mildly."
Annie, real name Anne Lilia Berge Strand, will release Don't Stop in July. Her previous album Anniemal featured the singles 'Heartbeat' and 'Chewing Gum'.
