whoa, i didn't even know he had a tattoo! shows how observant i am...
but i have absolutely no idea what it is. i know about as much as you guys have said. but i have to say, i'm sorry, but those are horrible pictures. his hair!! ick!! and this is why you NEVER EVER get the name or initials of a significant other tattooed. you're just asking the gods/fates/whoever to break you two up and leave you with a useless tattoo.
okay, that was a little off-topic, sorry, but yeah...i agree with lenkid, that definitely looks like some sort of symbol in the center.