Last month, Big Little Lies co-stars Nicole Kidman and Alexander Skarsgård caused a stir when they kissed on the lips during the Emmy Awards — while the actress' husband, Keith Urban, was standing right there.

The brief PDA was probably nothing more than a friendly celebratory gesture, since Skarsgård had just won the Emmy for Outstanding Supporting Actor in a Limited Series or movie. But during her recent appearance on The Graham Norton Show, the actress explained the surprising lip-lock.

'You are so provocative, Graham. Why are you showing that?' Kidman said when Norton projected a photo of her and Skarsgård leaning in for a kiss on the screen. 'I kissed my husband, too!'

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She continued to explain, 'I did kiss him, but you have to understand, I did everything with Alex-'

'We saw it!' Norton joked, interrupting her.

'Alright, I'm backing off,' the actress continued. 'I've got an amazing, supportive, gorgeous husband, who I love more than anything in the world. And I gave Alex a congratulatory kiss and he's like a mannequin.'

Well, that clears things up. Watch Kidman's full interview below.

MORE: NICOLE KIDMAN STEPPED OUT IN A STUNNING SEQUINNED MAXI DRESS

(Via Harper's Bazaar US)

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