The former Dawson's Creek star debuted the production, by Smash creator Theresa Rebeck, in New York on Monday night (05Nov12), but she admits the rehearsal period was far from easy.
Holmes reveals she suffered sleepless nights as she was plagued with anxiety about performing for the crowds at the city's Music Box Theatre.
She tells the New York Times, ""I have a hard time sleeping because I think about how serious this all is. I think about the cost of tickets. I think to myself, 'You better do a good job. People are paying a lot of money.' You want to know your stuff.""
Holmes made her Broadway debut in 2008 in a revival of Arthur Miller's All My Sons.