In the romantic selfie, Kutcher, 35, and Kunis, 30, share a passionate kiss at Sun Records underneath a neon sign titled "SUN" in Memphis, Tenn. Only their dark silhouettes are shown, with a glimpse of Kutcher's one eye and Kunis' sloppy bun. "Sunset #nofilter," the Jobs star wrote.
The intimate moment between the two comes just two weeks after Kutcher finalized his divorce from Demi Moore, 50. The estranged couple announced the end of their six-year marriage two years prior.
The former That '70s Show costars began dating in April 2012, and rumors have recently swirled about a possible engagement in the near future. After all, the Hollywood hunk has become very close to Kunis' family -- he even attended her brother's wedding over the weekend in St. Petersburg, Fla.
"Ashton was welcomed by Mila's family," an eyewitness told Us Weekly of the special occasion. "They seemed very comfortable together. He watched the ceremony from the front row and never took his eyes off of Mila."
Indeed, Kutcher was even invited to join the whole family at the altar for pictures following the ceremony. "They definitely treat him like a family member," the insider added. "He was holding Mila close, and they both had huge smiles on their faces. Ashton had his arm around Mila at all times and was always checking in with her. They did some goofy poses, too, and they seemed to be having a lot of fun."