I'd love to be patriotic and say QM, QE or QE2, but my heart goes "No. Normandie!"
As Ghostie says, she was so far ahead of her time. If she'd been built in 61, when France was launched, she would still have looked modern. France, QE2 and QM2 have all taken styling cues from her.
If only they'd listened to her designer, opened the sea-cocks and let her settle before she capsized. maybe things would have been different.