'Toxic' singer has also had sessions with a choreographer
Producer Naughty Boy reportedly wants to take Spears to Cumbria for creative inspiration
Leaked financial documents show Britney's love for a bargain – she spent nearly £50 at 99c stores
The track is taken from the upcoming 'Smurfs 2' soundtrack
Meanwhile, Les Misérables soundtrack becomes the first film cast recording to top the Official Albums Chart in almost 16 years
Singer will reportedly earn around £625,000 per night
The news follows rumours that the singer was set to resign from her position as a judge on the talent show
Sources say that star's stint on reality show 'isn't working'
Taylor Swift, Rihanna, Lady Gaga and Katy Perry all included
Judge says there wasn't enough evidence to continue legal action