Holden played the role of Sarah Trevanion in Wild at Heart (2006–2008) and the title role in Thoroughly Modern Millie, for which she was nominated for a Laurence Olivier Award.
Holden memainkan peran Sarah Trevanion dalam Wild at Heart (2006–2008) dan judul peran dalam Thoroughly Modern Millie, di mana dia dinominasikan untuk Laurence Olivier Award.