Lucy Punch will take over from Billie Piper as Paige Britain for the West End transfer of Great Britain.
Richard Bean's satire, which premiered at the National Theatre last month, takes a wide-ranging swipe at the press, police and political establishment in the wake of the phone-hacking scandal.
Paige Britain is the ambitious young news editor of The Free Press, a tabloid newspaper locked in a never-ending battle for more readers.
Lucy Punch's previous theatre credits include Boy Gets Girl for the Royal Court, A Carpet, A Pony, and A Monkey for the Bush Theatre and The Graduate in the West End.