High Quality Content by WIKIPEDIA articles! Siobhan Patricia Dillon (born 1 September 1984, Lichfield, Staffordshire) 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? on BBC One in 2006. Since then she has starred as Sandy in the musical Grease at the West End`s Piccadilly Theatre and as Vivienne Kensington in the musical Legally Blonde at the Savoy Theatre in the West End.