updated 06/28/2008 AT 11:00 AM ET
•originally published 06/28/2008 AT 12:00 PM ET
“We shot it at three o’clock in the morning and so everyone was a bit delirious anyhow,” Olsen, 22, tells the Wall Street Journal about working with the 64-year-old Gandhi Oscar winner.
The heavy smooch takes place in a phone booth – but the two did anything but phone in their performances. “He was so professional about it and made me feel so comfortable,” she says. “He said, ‘Anything you don’t feel comfortable about, let me know. You lead me.’ “
As Kingsley told PEOPLE earlier this week about his scene with Mary-Kate, “She was completely in charge.”
Playing a character named Union, a dreadlocked urban nymph, Olsen tells the Journal, “She’s a young free spirit and she has a lot to learn. I think everybody has a phase they go through where they think they know a lot more than they do.”
One other thing the newspaper was particularly curious about: how come Mary-Kate and twin sister Ashley look so much alike (a trait said to be uncharacteristic of fraternal twins).
“Our eyes are different,” Mary-Kate points out. “Ashley’s are rounder and mine are cat-eyed.”