The actor reveals he listened to her poetry reading every morning in a bid to get all loved-up for the day's romance.
He tells Wenn, "I spent some time creating the romance... I got Rachel to record a poem for me and I would listen in the morning before I'd go work. I'd also listen to the song Mid Air by Paul Buchanan every morning when I got up and I spent a lot of time just thinking about love. That got me in the mood."
But that was all destroyed by director Richard Curtis the minute he and MCAdams started shooting.
Gleeson adds, "Richard was in the corner like some pervert looking at us saying, 'That looks great, guys'. I'm like, 'Jesus, don't say that Richard!'"