Everyone thinks they can sing at 4:30 AM with their friends -- but "X-Men" star James Marsden actually can ... shockingly well ... and he proved it early Friday morning outside a famous NYC hot dog stand.
Seriously, you gotta check this out -- dude gives Stevie Wonder a run for his money.
"X-Men" Star [VIDEO]
Cyclops Can SING!!!!!!!!!!
9/24/2011 3:00 AM PDT BY TMZ STAFF
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