Scarlett Aimee Vaigncourt-Strallen (born 3 July 1982) is an English stage actress, best known for her work in musical theatre productions in the West End and on Broadway.

Zizi played Mary Poppins like her eldest sister, first in a new UK tour and subsequently in the West End.

Strallen played the title role in the West End production of Mary Poppins opposite Gavin Lee as Bert, at the Prince Edward Theatre from 2005 (as a replacement to original cast member Laura Michelle Kelly) to 2006, when she left to join The Royal Shakespeare Company's musical production of The Merry Wives of Windsor in Stratford.

[4] She had expressed interest in the West End production of Wicked, but could not audition due to her involvement with Mary Poppins.

[8] Later in 2013, Strallen appeared in the Menier Chocolate Factory production of Candide, where she played the role of Cunegonde from 23 November 2013 to 22 February 2014.

[9] On 5 September 2015, Strallen made her Proms debut at the Royal Albert Hall performing the coloratura aria "Glitter and be Gay" among highlights from Candide with the John Wilson Orchestra.