Pixie Lott and Frankie Bridge are taking part this year, and show insiders said that 'novices' like Mark Wright are unhappy that they are so experienced at dancing.
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Producers of the hit BBC One show are said to have banned Pixie, Frankie and Caroline Flack, who previously won BBC Three's Dancing On Wheels, from early rehearsals to give the others a chance.
A source told The Sun: "Some of the stars this year feel they had a real disadvantage. They didn't waste any time making their feelings known. After several complaints, bosses decided they'd have to do something to 'even the playing field' a little.
"Inevitable, the celebrities feel like they are now on two different sides, and it has affected them."
Pixie, 23, spent eight years studying at dance school, while Frankie, 25, also attended stage school before hitting the big time with The Saturdays.
Other celebrities taking part this year are Essex boy Mark Wright, 27, 36-year-old Blue singer Simon Webbe, EastEnders' star Jake Wood, 42, and Andy Murray's mum Judy, 54.
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The added: "There are always people who don't get on. At times that has a tendency to become obvious."
However, last night the BBC said: "Timings are dictated by contestants' personal commitments. Production have not held back anyone's rehearsal time."