Sam Rockwell won the second prize of the night for best supporting actor in a movie for Three Billboards Outside Ebbing, Missouri, while Rachel Brosnahan won the best actress in a TV comedy prize for The Marvellous Mrs Maisel.
"Nicole, I love you", he said.
Big Little Lies won big at the Golden Globes earlier this week by nabbing awards in every category in which it was nominated.
As Alexander's name was announced as the victor of Outstanding Supporting Actor In A Limited Series Or Movie award at the 2017 awards show, Nicole jumped to her feet and pulled him in before planting a big kiss on his lips - right in front of husband Keith Urban.
Others pointed out that Nicole had done the same thing in her acceptance speech at the Emmy Awards last fall, when she picked up a statuette for the same role.
Kidman did not disappoint him and kept on blowing kisses back to her on-screen love interest, while he was sharing his acceptance speech.
With last year's expensive rings obviously left at home, the 50-year-old was free to slap her hands together however she damn well pleased at this year's Golden Globes ceremony. And it's been a decade since Kidman has been publicly spotted with Connor and Isabella.
Daughters Sunday Rose and Faith Margaret were also acknowledge.
After her big win at the Golden Globes, Kidman celebrated by posting her first Instagram photo - a shot of her shutting down the after-party.
The Sydney-raised star has rarely spoken about the reason behind her split from Cruise, however, many have speculated his involvement in Scientology played a major role. "I am so proud of my Big Little Lies family and to have stood with my sisters on such a special night", the caption reads.