The class is an aerobic workout based on strip tease and poll dance routines designed to tone up and increase fitness, according to website X17.

Lindsay has also started joined Alcoholics Anonymous in a bid to turn over a new leaf and clean up her lifestyle.

Although the 20-year-old actress was seen with a glass of champagne at the GQ awards two weeks ago, she has since been seen at Los Angeles hotspots Hollywood Social, Hyde and Chateau Marmont drinking water.

Lindsay has ditched her party animal pals such as Paris Hilton and has only been socialising with her non-celebrity friends, according to the New York Post newspaper.

A source said: "Her family just hope it lasts."

The Just My Luck star was first seen going into an AA meeting in Los Angeles at 7.30am two weeks ago.

A source said: "She has attended several meetings and has hopefully decided to turn her life around - this time for good. She is out of control."

Her concerned mother Dina has flown to Los Angeles to help her daughter.

Lindsay is currently shooting The Best Time of Our Lives with British actress Keira Knightley.