Rob Kardashian just checked into treatment for depression, which has led him into unhealthy habits with food, alcohol, marijuana, and prescription cough syrup.
Kelly Osbourne has gone to rehab in the past for substance abuse, but her most recent trip was for food.
David Duchovny went to rehab for his sex addiction in 2008.
After her 2001 shoplifting incident, Winona Ryder was forced to undergo psychological counseling.
Kirsten Dunst received in-patient treatment for depression and admitted publicly that she was annoyed that people thought she was there for drugs.
LeAnn Rimes voluntarily entered a rehab facility to deal with her stress and anxiety due to cyber bullying.
Though she struggled with drugs in the '80s, Demi Moore's 2012 rehab stint was to deal with anorexia and a dependence on prescription pills.
Catherine Zeta-Jones shocked the world when she entered treatment for bipolar disorder.
As a teenager, Mary-Kate Olsen checked into rehab for an eating disorder.
Britney Spears entered rehab for undisclosed issues in 2007, after shaving her head and attacking a paparazzo's car with an umbrella.
Chris Brown spent months in rehab for his anger issues before being booted out in March 2014 for breaking several internal rules.
Amanda Bynes spent six months in a rehabilitation facility for apparent bipolar disorder after a series of erratic behavior in 2013.
Ke$ha entered rehab for an eating disorder in 2014.
After attacking one of her back-up dancers, Demi Lovato entered rehab for bipolar disorder and substance abuse issues.
Selena Gomez revealed, after the fact, that she had spent time in rehab for emotional issues.