Doesn't look like the underwhelming-yet-overpriced sushi at Japonais did the trick for Mariah Carey and Nick Cannon, 'cause right after, they parked right outside Slyder heaven -- White Castle.
Sadly, this was one trip without a cameo by Neil Patrick Harris.
Mariah & Nick Go to White Castle
1/7/2009 4:10 PM PST BY TMZ STAFF
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