Spears had taken a two-week-long break with her two children and new boyfriend, Jason Trawick, after finishing the British leg of her world tour and seemed to have piled on the pounds, reported Daily Mail online.
The 'Toxic' hitmaker who had recently dyed her hair brown, wore a series of her trademark revealing costumes when she hit the stage after the holiday, making the weight gain apparent.
But with back-to-back concerts lined up, the 27-year-old is bound to soon be back in shape.
Following her spell in the UK, Spears had returned to Los Angeles, and stayed out of the spotlight as she relaxed with Jayden James, 3 and Sean Preston, 2.
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