BRITNEY SPEARS, 31
This former Mickey Mouse Club child star grew up to make many successful records...and headlines.
She shed her wholesome image (no drinks, no sex, she previously claimed) in 2007 and entered a drug rehabilitation facility. The day after, she shaved her head because her locks could prove that she had been taking drugs.
In 2008, she entered a psychiatric ward, but was released shortly after.
She has since cleaned up her act.
LINDSAY LOHAN, 27
The former Disney star has seen the inside of a jail cell on multiple occasions.
In 2007, she was jailed a day after pleading guilty to cocaine use and driving under the influence.
In 2010, she served two weeks in prison after failing to attend her court-ordered weekly alcohol education classes.
In 2011, she was charged with burglary after leaving a jewellery store with a necklace. She was sentenced to jail, but served her stint under house arrest.
She has been in and out of rehab since 2007 for drugs, drink driving and violation of probation.