Pete Townshend of The Who. He was charged with using a kiddie porn website. He explained he was trying to prove that credit card companies make money off of child porn sites.
Gary Glitter (did Rock and Roll Part 2). Jailed in Vietnam. His victims were aged 10 and 11.
Jerry Lee Lewis. His cousin once removed (daughter of his first cousin) was 13 when he married her. Nice and legal, apparently.
Who else belongs on the list?