James Franco and Mila Kunis at CinemaCon 2012 in Las Vegas. Credit: Chris Pizzello/AP Photo

Another day, another handsome Hollywood hunk at Mila Kunis' side.

After a three-day getaway outside of Los Angeles with Ashton Kutcher, the stunning 28-year-old actress got back to work in Las Vegas -- with James Franco.

She and Franco, 34, are currently filming Oz: The Great and Powerful together with Michelle Williams, Rachel Weisz and others, and the sexy pair talked up the high-profile Wizard of Oz redux onstage at CinemaCon.

Former That 70s Show costars Kunis and Kutcher, 34, sparked a tumult of speculation when they were photographed having a one-on-one weekend in the seaside town of Carpinteria, Calif. shopping at roadside stands, lunching and more. But although the pals reconnected after Kutcher's sloppy split from Demi Moore last November, a Kunis source tells Us Weekly she has her guard up with the Two and a Half Men star.

"Mila wouldn't stand for that kind of stuff," the insider says of Kutcher's notorious infidelity. "She's a strong, smart girl." Kunis split with Macauley Culkin in late 2010 after eight years together.

For the record, 127 Hours star Franco has reportedly been single since his July 2011 split with Ahna O'Reilly, his actress girlfriend of five years.