Sean Stewart is the 28-year-old son of Alanna and Rod Stewart and has been battling drug addiction since high school. He's been in and out of treatment programs throughout adulthood and is now one of the cast members of Celebrity Rehab. He's pretty much remained low key, but during a group session on last night's episode, he opened up about the root of the self hate that has fuelled his addictions, which he says are caused by insecurity over occasional erectile dysfunction, penis size, and the fact that, when he was 11, someone called him "a waste of sperm and egg." Dr. Drew asked who said that to him, and although it's bleeped out, it seems like he says "my fucking father." Clip above.