Nicole Scherzinger has joined Skinny Bitch Collective.
The former Pussycat Doll has become the latest celebrity to attend the invite-only exercise classes - loved by stars including model Suki Waterhouse and former 'Made In Chelsea' star Millie Mackintosh - to help burn off those extra Christmas calories.
Trainer Russell Bateman runs the SBC classes - which are comprised of intense 50 minute circuits - and revealed Nicole, 36, was especially good at the high-energy work out sessions due to her dancing background.
Russell told MailOnline: "I had the opportunity to train Nicole last week and she was incredibly nimble and explosive.
"A dancer's background can really help you acclimatise to the movements much quicker."
Russell also shared his top tips for those who wish to follow in Nicole's footsteps and get in shape for 2015, advocating a positive mind and "self-acceptance" as the first step in order to make lasting changes to your body and lifestyle.
He said: "If you want to lose body fat, feel great, increase your energy level and improve your overall quality of life, then there are a list of lifestyle choices and changes you can make.
"My aim through SBC is to abolish the misconceptions around how women train, eat and live.
"Low fat diets are out, good fat is your friend.
"Be as human as possible when you train. Boredom is the enemy and so is anyone around you who's bringing you down.
"Making peace with where you are at right now in your life is the first step to self-acceptance and making lasting changes."