Updated: 06 January 2014 18:30 | By Colleen Last
Ke$ha and other stars who've been to rehab

Zac Efron



Zac Efron (© Getty)
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Zac Efron only revealed his rehab stint after it was complete - he spent time at a clinic last April and has recently been seen wearing an Alcoholics Anonymous sobriety tag around his neck, celebrating six months sober.

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