One scene in the comedy flop called on Charlize Theron to place a flower between Liam's butt cheeks, but he wasn't about to bear his rear for the cameras, so he asked his longtime on set sidekick to take one for the team.
"Mark Vanselow is my stunt co-ordinator - we're working now on our 24th film together - and when we were doing that movie... I hate my Irish butt," Liam said during an appearance on "Watch What Happens Live". "I said to Mark, 'This is a sign of our friendship, would you ever do this scene where Charlize Theron puts a daisy in your butt?' And he said, 'Sure.' "
"I gave him a big hug afterwards. I said, 'There's no f**king way is anybody gonna see my Irish butt!' "