to the best of my knowledge St.Jude's Hospital has been the primary charity that Jennifer Aniston is involved with. she has been for years. at least since 2003 maybe before that but I haven't been able to find it. the article below however mentions her involvement in 2003
http://justjared.buzznet.com/2006/11/08/jennifer-aniston-st-judes/
http://www.looktothestars.org/celebrity/92-jennifer-aniston
also I think there are many celebrities involved one way or another with st.jude's but it is just not publicized I guess.
here are some of them:
http://www.looktothestars.org/charity/80-st-jude-childrens-research-hospital
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