By Staff Writer (staff@latinospost.com) | First Posted: Dec 12, 2013 07:32 AM EST

You see them together, holding hands and hugging for the past 18 months or so. But you never hear them talk about their relationship or of each other in a tone that's beyond professional or dismissive.

This is why Ashton Kutcher's recent photo of him and ladylove Mila Kunis sharing a smooch, uploaded on his Instagram account, caused a stir among netizens, fans, and celebrity watchers alike. Could this out-of-character move signal more promising things to come? Like news of an engagement, perhaps?

It may be recalled that that the 35-year-old actor and ex-wife Demi Moore's divorce has been finalized after 2 years on November 26, according to Us Weekly. However, a source told the American magazine that the former couple needed to prepare more documents before they can "officially move on."

This bit of news have since triggered speculations that the That '70s Show co-stars may soon get engaged as there now are no legal obstacles that would keep them from taking their relationship to the next level. Recent news about the actor's supporting role in the wedding of the Jupiter Ascending star's brother have only intensified rumors that a proposal may just be around the corner.

Us Weekly said that an eyewitness of the St. Petersburg, Florida wedding, where the 30-year-old actress served as bridesmaid, observed that the Jobs actor "was welcomed by Mila's family" and that "they definitely treat him like a family member."

The "kiss in the shadows" Instagram photo goes against Ashton's previous convictions about keeping his relationship private. The Daily Mail said he was notably quoted by Elle Magazine last April as saying that he is "going to do everything in my power to have this relationship be private."

Apparently, his love was overflowing that he couldn't help but let it wash over his un-private social media account and the rest of the world.