Dressed in a figure-hugging white Herve Leger dress which allowed for not an inch of excess flesh, the LA based Brit wowed the waiting crowds.
Admittedly she had a reason for attending, the film was directed by husband Len Wiseman, who was at the helm for Willis' return as wise-cracking cop John McClane, in Die Hard With A Vengeance.
Following the premiere of Die Hard 4.0 which sees Willis, who last played character McClane 12 years ago, back to save the world from cyber-terrorists, the stars moved on to the after-party where a loved-up Beckinsale and Wiseman smooched in full view of partygoers.
In a display of dirty dancing that caused far more excitement than anything Bruce could manage on screen - not bad for a couple who have been married for more than three years - they smooched around the dancefloor at Cirque so closely entwined that at one stage it looked as if it would take a crowbar to prise them apart.
Beckinsale, who has a four-year old daughter Lily, with Welsh actor Michael Sheen, met the American-born director on the set of Vampire film Underworld, which also starred then husband Sheen. Soon after, the couple parted and she married Wiseman in 2003.
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