09/05/2008 at 08:00 AM EDT
She may not have been on his arm for the Toronto Film Festival premiere of RocknRolla
(blame her touring schedule!) but Guy Ritchie says his wife Madonna was there for him throughout the making of the film.
"She's been very supportive," Ritchie, 39, told PEOPLE. "It was great."
That said, he told reporters that he didn't know the secret of a happy marriage. "That's a toughie," he conceded. "If you know, you tell me."
The stars of Ritchie's film also had tons of praise for the Material Girl, who often visited the set.
"She's gorgeous," Toby Kebbell said. "A lovely, stunning woman."
Added Ludacris: "Madonna was so low key and so incognito that I hardly noticed her, and when I did it kinda caught me by storm. But honestly speaking, she's a really down to earth, really cool individual. I'm glad I got a chance to meet her – rub some of that energy off!"
2001: Madonna and Guy Ritchie get married
2008: Despite affair allegations, Madonna and Guy stick it out