Britney Spears will cancel her upcoming tour if her kids don’t come with her.

A number of Web sites claim the queen of pop is on the verge of pulling the entire 44-date run because she’s so concerned over where tots Sean Preston and Jayden James will live while their mother is on the road.

The Circus tour was due to kick off on March 3 in New Orleans before taking in a further 35 shows across America.

The European leg of the jaunt was to have taken place at The O2 in London with 8 dates kicking off on June 6.

TMZ.com insists an agreement had been made between ex husband Kevin Federline, Britney and her father Jamie Spears that would allow the kids to tour with her mother.

Britney would have homes in three bases – New Jersey, New Orleans and Los Angeles which her tots would stay at and from where she could essentially commute to her concerts.

But, the site claims, that when K-Fed’s lawyers heard about the proposal they objected to it and have refused to specify why, leaving the entire tour in jeopardy.

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