Siobhan Patricia Dillon[1] (born 1 September 1984) is an English actress and singer, who rose to fame when she performed in the British talent show-themed television series How Do You Solve a Problem Like Maria?

Dillon was in the middle of a BA Hons degree in Product Design and Development for the Fashion Industry, Accessories pathway at Cordwainers College, University of the Arts London.

However, after finalist Emilie Alford dropped out of the competition, Dillon, being the last person eliminated during the selection process returned to the show and was given the nickname, "Second Chance Maria".

Show producer, David Ian said of Dillon, "I knew that Siobhan was something special when I first saw her for The Sound of Music, and I am very pleased that she will be joining the cast of Grease.

[citation needed] Dillon returned to the production on 25 January 2010 this time taking over the lead role of Sandy from Emma Stevens.

[9] In July 2008 she was cast in the tour of Can't Smile Without You, a new musical based on an original idea by Bill Kenwright and featuring the hit songs of Barry Manilow, alongside Chesney Hawkes and I'd Do Anything contestant Francesca Jackson.

[11] Dillon won a record deal with Andrew Lloyd Webber’s company the Really Useful Group (RUG) after How Do You Solve a Problem Like Maria?.

[10] She is said to be writing and recording her first album,[6] although on her Myspace page she is quoted saying, that after Andrew Lloyd Webber announced during one of the live How Do You Solve a Problem Like Maria?

Dillon took over the part of Vivienne Kensington from Caroline Keiff in the West End production of Legally Blonde on 25 October 2010.

finalist to star in the musical, as fellow ex-contestant Aoife Mulholland was playing Brooke Wyndham at the time she took the role.

Beginning performance 13 January 2012, Dillon replaced Caissie Levy in the lead role of Molly Jensen in Ghost the Musical at the Piccadilly Theatre in London's West End.

In 2013, she reprised her role as Sally Bowles in the revised UK tour of Cabaret, starring alongside Matt Rawle and Will Young.