Britney Spears is reportedly following an extremely restrictive diet and exercise regimen at the moment.
The pop star co-judges on
Simon Cowell's hit US TV talent show
The X Factor with Simon,
Demi Lovato and L.A. Reid.
Britney began her post last week and is committed to remaining in great shape throughout the season.
"
Britney has been on an extreme diet and exercise regime," a source told British newspaper The Sun. "She has been cutting out ...