And now, the unlikely trio have made a joint appearance once again, this time front row at the Giorgio Armani Prive Haute Couture Fall/Winter 2019 2020 show for Paris Couture Week.
Nicole, 52, was the filling in between an Urban and Skarsgård sandwich as the Hollywood stars watched the couture show.
However, fans couldn’t help but gawp when Nicole was later pictured affectionately placing her hand on both Keith AND Alexander’s thigh.
However, Keith need not have been worried. The Lion star – who shares daughters Sunday Rose, 10 and Faith Margaret, eight – put on her usual OTT display of affection with the country music star as they walked the red carpet together before the fashion show.
Nicole attempted to explain her passionate kiss with Skarsgard at the Emmys during an appearance on The Graham Norton Show in 2017.
“I did kiss him, but you have to understand, I did everything with Alex,” she said.
“We saw it!” Norton joked back.
“All right, I’m backing off,” she replied. “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.”
Kidman and Skarsgard famously shocked viewers during season one of Big Little Lies. The pair - who play husband and wife Perry and Celeste in the hit HBO show - made headlines with their graphic sex scenes and controversial depiction of domestic violence.