Selena Gomez (2014). (Photo: Instagram, @selenagomez)
Joaquin Phoenix (date unknown). (Photo: Instagram, @reixxx_)
Zac Efron (2013). (Photo: Instagram, @zacefron)
Winona Ryder (date unknown). (Photo: Instagram, @winonaryder_)
Joshua Jackson (2003). (Photo: Instagram, @vancityjax)
Tara Reid (2008). (Photo: Instagram, @tarareid)
Ben Affleck (2001). (Photo: Instagram, @benaffleck)
Philip Seymour Hoffman (2013). (Photo: Instagram, @rollingstonebrasil)
Scott Disick (2015). (Photo: Instagram, @letthelordbewithyou)
Ke$ha (2014). (Photo: Instagram, @iiswhoiis)
Britney Spears (2007). (Photo: Instagram, @britneyspears)
Chris Brown (2013). (Photo: Instagram, @chrisbrownofficial)
Cory Monteith (2013). (Photo: Instagram, @finchelislife)
Kirsten Dunst (date unknown). (Photo: Instagram, @kirstendunst)
Elton John (1990). (Photo: Instagram, @eltonjohn)
Kim Richards (2015). (Photo: Instagram, @kimrichards11)
Eva Mendes (2008). (Photo: Instagram, @evamendes)
Eminem (2005). (Photo: Instagram, @eminem)
Demi Lovato (2010). (Photo: Instagram, @ddlovato)
Mary-Kate Olsen (2007). (Photo: Instagram, @_mary_kate__)
Here is a list of 20 celebrities who have either secretly, gracefully entered rehab or were dragged there kicking and screaming in a bid to get clean from drug and/or alcohol or to get help for eating disorders, depression and other ailments.