James Franco, Zachary Quinto lock lips at the Sundance Film Festival

Los Angeles: Hollywood actors James Franco and Zachary Quinto locked lips at the 2015 Sundance Film Festival.

The "I Am Michael" co-stars got into a sponsored slow motion video booth and shared a kiss underneath a popcorn shower, reports aceshowbiz.com.

Franco and Quinto, who are also best friends off screen, could be seen in the video staring into each other's eyes first before leaning in close to one another. Both of them burst into laughter as they finished their "kissing session".

Getting steamy wasn't something new for both Franco and Quinto as they have done a threesome sex scene with co-star Charlie Carver for "I Am Michael", which was released at the 2015 Sundance Film Festival that was held from Jan 22 to Feb 1.

The film tells the true story of gay activist Michael Glatze who rejects his homosexuality and becomes a Christian pastor.