Ashton Kutcher and Mila Kunis Kissing

Kutcher and Kunis kissing on July 21

For two people who claim they aren't dating, Ashton Kutcher and Mila Kunis sure spend a lot of time kissing!

On Saturday, Kutcher attended the wrap party for his Steve Jobs biopic, "Jobs," in Los Angeles with a special guest in tow: Kunis. During the bash, the one-time "That '70s Show" co-stars sat on the balcony of the venue and looked very cozy. In addition to kissing in plain sight, Kunis sat on Kutcher's lap, wrapped her arms around him, stroked his face, and played with his hair. They didn't appear to be hiding their feelings for one another as other partygoers were nearby while they engaged in PDA.

Kutcher and Kunis getting sushi on April 15

This latest sighting comes one week after Kutcher, 34, picked up Kunis, 28, from the gym on his motorcycle and they sped off to meet her family at a Los Angeles cemetery. While there, they visited the grave of Kunis’ late grandmother – it was reportedly the anniversary of her death – and Kutcher seemed at ease with Kunis’ family at the intimate affair.

Friends since their days on "That '70s Show" (their characters, Kelso and Jackie, dated), Kutcher – whose marriage to Demi Moore ended last November amid reports he had an extramarital affair – and Kunis started spending time together in April after they reunited to film "FOX's 25th Anniversary Special." Soon after, they were seen on a sushi date, which was followed by a four-day weekend getaway in the beach town of Carpinteria, California. More recently, they have been seen together frequently in Los Angeles, including at a July 4th barbeque where they were also photographed smooching.

Despite all the signs pointing to a hot romance, Kutcher and Kunis have continuously denied that they are dating. After branding the claim "absurd" back in April, Kunis vented about the rumors in Glamour magazine’s August issue, saying, "Ninety-nine percent of it is bulls—t. That is the biggest form of bullying ever, the paparazzi. Printing lies, making accusations, it's just bullying." And in the August issue of the UK edition of Elle, Kunis, who dated Macaulay Culkin for nearly a decade before splitting in 2011, also denied a romance. "I am totally single," she said. "Listen, we hang out. We've known each other for 15 years. We have mutual friends. We're comfortable with one another. That's it! There's no crazy love story, nothing more."

However, a source told People magazine that Kutcher has long held a torch for Kunis. "He was so in love with her for a while when they worked together. He thought she was a goddess, was always talking about how beautiful she is. But she was with Macaulay for a lot of that time and also just generally gave off a not interested vibe."

Well, let's just say that the vibe she is giving off now says something very different.