The 36-year-old actor says the first time he met Dench on the sets of "Murder On the Orient Express" he was in awe of her, reported Femalefirst.
"It goes beyond a crush. I flat out told my wife that if there was ever an opportunity, I would leave her for Dame Judi and the funny thing is she pretty much agreed to it.
"The first time she came into the make-up trailer, there as this silence because everyone was so intimidated. But - idiot that I am - I just walked over to her and said, 'Dame Judi Dench?' Only it came out sounding like, 'Damn Judi Dench'. Still, that was it. It broke the ice and allowed us to look into each other's eyes and see what was there... Pure, unadulterated love," Gad says.
"When Johnny walks onto the set, there's this charisma that's just breathtaking. He was so gracious too, and threw everyone a really lavish party at his place in London.
"I'd hesitate to call it (a bromance) because I'd feel like I was cheating on Luke (Evans) - our entire relationship on 'Beauty and the Beast' press tour was billed as 'the biggest of bromances' - but also because I'm confused about why male always get asked whether they're having bromances," he says.