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Kirsten Dunst and Jesse Plemons have taken their onscreen love into the real world.

The Fargo co-stars, who play husband and wife on the hit series, packed on the PDA at FOX's 2016 Emmys after-party. An eyewitness tells E! News exclusively that at one point during the evening Dunst "leaned into Jesse and very passionately kissed him on the lips after she caressed his cheek very affectionately."

Plemons and Dunst arrived at the after-party together and appeared "to be very much a couple," the insider adds. "They've been stuck to each other's sides all night."

After they hit up the Fox party, the couple made their way to host Jimmy Kimmel's after-party where they danced the night away and continued their kissing spree, another source tells E! News. 

E! News has reached out to reps for comment.

Kirsten Dunst, Jesse Plemons

Kevin Winter/Getty Images

Speculation surrounding the co-stars' relationship began after the two were spotted kissing in May, about a month after she and Garrett Hedlund called it quits. The split came as a big surprise to fans, as Dunst and Hedlund had stepped out together at the 2016 Golden Globes and FOX's award show party. She had also gushed about her then-boyfriend in Town & Country.

"We're the same age. We have similar backgrounds," she shared with the publication. "He feels like family to me."

If that weren't enough, the actress admitted that she was thinking of getting pregnant after being surrounded by a few moms to be. "I'm in baby mode because two of my really good friends are pregnant right now," she confessed to Red U.K. "Thirty-three is a good age to have your first baby."

Watch E!'s live 2016 Emmy Awards red carpet coverage starting at 4:30 p.m. ET/1:30 p.m. PT on Sunday, September 18th