Music
Rex Features
The singer was expected to reunite with Madonna on stage in Miami to mark the end of the pop queen's 'Sticky And Sweet' tour. Spears made a surprise appearance on the Los Angeles leg of Madonna's tour last week.
"Britney had always agreed to perform in Miami but her circumstances have changed over the past couple of months," a source told The Sun.
Spears was granted custody over her two sons for the US holiday period, which falls on November 27, the day after the Miami duet had been scheduled.
"She and Kevin are getting along fine now, Britney will have Jayden and Sean just before the holiday and Kevin will spend Thanksgiving day with them," the insider added.
Spears releases new album The Circus on December 1.
> Click here to read our thoughts on Britney's new album
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