Mila Kunis and Ashton Kutcher did not hide their affection for one another at the premiere afterparty on Wednesday for her film Oz the Great and Powerful.

Kunis, 29, walked the yellow brick red (instead of a red carpet) at the Los Angeles premiere wearing a Dolce & Gabbana dress and Christian Louboutin heels. The 29-year-old actress posed with costars Michelle Williams, James Franco, Rachel Weisz and Zach Braff before heading inside the El Capitan Theatre.

Kutcher, 35, did not attend the screening but the couple arrived hand-in-hand at the film's official afterparty held at Lure nightclub just before 10:30 p.m., an attendee told Us Weekly.

"They headed straight for the buffet, where they piled their plates with lemon garlic seared chicken breast and butternut squash ravioli," the partygoer said.

The former That '70s Show costars then sat in the reserved section of the club. Kutcher wore a white baseball cap and white sweatshirt, while Kunis merely put a black jacket over her premiere dress. The partygoer told the magazine that "Mila ended up sitting in Ashton's lap," and by 12:18 a.m., "Mila and Ashton kissed softly on the lips," as Kutcher "wrapped her in his arms" and Kunis leaned her head against his shoulder.

Kutcher and Kunis have displayed their attention in public settings before, however, they both stay relatively mum when asked about their relationship. Kunis was on The Ellen DeGeneres Show Wednesday and when the talk show host about her about her Valentine's Day plans or made any reference to Kutcher, Kunis blushed and tried to avoid answering the question.

After asked whether or not she still talks to her That 70's Show castmates, DeGeneres flashed a huge image Kutcher on the big screen.

"When's the last time you talked to him?" the comedian asked.

Kunis finally caved and said, "It's been give or take a couple of minutes."

The actress did similar in a recent interview with Allure magazine for its March issue, in which Kunis is on the cover of.