"Vampire Diaries" star Ian Somerhalder can make a girl orgasm just by touching her -- at least that's the way it looks in this video, showing a USC student spontaneously bursting into "Natural Woman" last Tuesday ... as soon as she holds his hand.
Ian had just finished an Earth Day talk at the school -- he's a big conservationist -- when student Shelby Miguel dropped the Aretha assault during a meet-and-greet ... out of nowhere.
It's pretty damn ballsy -- not to mention awkward as hell -- but check out the video ... she's got a great voice.
Ambushed By Singing Fan
'You Make Me Feel Like a Natural Woman!'
4/29/2014 12:15 AM PDT BY TMZ STAFF
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