Fearn performed as Rapunzel in the version of Into the Woods at Regent's Park Open Air Theatre in London for the summer season of 2010, alongside Hannah Waddingham (Witch), Michael Xavier (Big Bad Wolf / Cinderella's Prince), Jenna Russell (Baker's Wife), Helen Dallimore (Cinderella) and Beverly Rudd (Little Red Riding Hood).
[5][6] Fearn has played the role of captain Beverley Bass in Come from Away, taking over from Rachel Tucker, at the Phoenix Theatre in London, until the show closed in January 2023.
[7] On 6 February 2023 she performed 'Me and the Sky' at Leicester's Curve Theatre to announce the launch of the UK tour of the show, starting from the venue on 1 March 2024.
[10] Fellow cast members included: Brittney Johnson, as the Queen of Hearts and Ra'ed Saade, Netflix star of My Unorthodox Life, as Barry.
[16] Fearn has a long career as a singer/voice artists in major films, from movie musicals such as Sweeney Todd: the Demon Barber of Fleet Street, Mamma Mia!, Les Misérables, to Alice in Wonderland, How to train your dragon, Robin Hood and Life of Pi among many.
[17] Fearn joins many West End and Broadway stage actors making an appearance in the movie, such as Andy Nyman, Adam James, Sharon D. Clarke, Kerry Ellis and Courtney-Mae Briggs.
Cast for the concert included: Oliver Tompsett, Louise Dearman, Sophie Evans, Claudia Kariuki and Liam Tamne and was hosted by Matt Lucas and Rob Houchen.