Ashton Kutcher, Mila Kunis photographed kissing

Actress Mila Kunis speaks at the "Oz: The Actress Mila Kunis speaks at the "Oz: The Great and Powerful" panel during Comic-Con International 2012 in San Diego. (July 12, 2012) Photo Credit: Getty Images

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Photographs appearing to show Ashton Kutcher and Mila Kunis kissing and cuddling on a balcony have renewed speculation that the former "That '70s Show" stars and longtime friends are romantically involved.

Celebrity website X17Online, which posted the photos, said they were taken Saturday afternoon during the Hollywood wrap party for "Jobs," in which Kutcher plays Apple co-founder Steve Jobs.

In response, Kutcher, 34, tweeted Monday, "Apparently the privacy of your own home is no longer the privacy of your own home."

Kunis' spokeswoman did not return a request for comment.

"Listen, we hang out," the actress 28, said of herself and Kutcher in the August issue of Elle UK. "We've known each other for 15 years. We have mutual friends. We're comfortable with each other."

Us Weekly -- which claims the two friends became romantic this past spring -- Monday said Kutcher and Kunis sat close together at the wrap party and were openly affectionate in front of fellow partygoers. The magazine said the couple had dinner together earlier this month at the Los Angeles restaurant Soho House, where they reportedly sat on the same side of the table, Kunis played with Kutcher's hair and rubbed his shoulders, and Kutcher kissed her on the cheek.

Kutcher is separated from actress Demi Moore, who in November announced she was divorcing him following reports of his infidelity.

Kunis, who currently stars with Mark Wahlberg in "Ted," was in an eight-year relationship with actor Macaulay Culkin that ended in late 2010.

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