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Newlyweds MARIAH CAREY and NICK CANNON enjoyed a magical night at Six Flags Magic Mountain in L.A. on Tuesday evening -- and the star couple invited only ET's KEVIN FRAZIER and our cameras inside the theme park with them! Tune in to Entertainment Tonight on Wednesday to see all the romantic fun.

Mariah couldn't believe her eyes when she and Nick arrived in a Rolls-Royce at Six Flags, only to find it transformed into a private party palace just for them -- a special surprise arranged for her by Nick!

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