Witherspoon was equally panicked, but they both knew to do the film justice they should avoid lip-synching.
Phoenix says, "I spent months rehearsing the singing part and every once in a while I'd think, 'I can't sing this! Why don't I just lip-synch it?' I'd call up Reese and tell her I'd quit the singing bit if she did.
"We'd agree to lip-synch for about five seconds - and then revert back to the singing."