Brook will join the company Oct. 13 in the role of Jeannie, currently being played by original cast member Joanna Page (through Oct. 11).
Brook will join Kevin Bishop as Carter and Nicholas Burns as Tom, who are, respectively, succeeding Kris Marshall and Robert Webb when the play transfers to the Comedy. Ella Smith will remain in the role of Helen.
Brook, who recently took part in "Strictly Come Dancing" on BBC1, is an English model, actress and TV presenter who topped the "FHM 100 Sexiest Women in the World 2005" list. She graced the covers of of GQ, FHM, Sky, Cosmopolitan, Tatler, The Face and Company by the age of 16. She was a presenter of Channel 4's Big Breakfast, followed by a stint as host of MTV's Select. Onstage she has appeared in Eye Contact at the Riverside Studios in London, and her films include "The Italian Job," "Deuce Bigelow: European Gigolo" and "Sorted."
Fat Pig, which is directed by its author, revolves around the developing relationship of Tom (Burns) and the plus-sized Helen (Smith), much to the consternation of Tom's work colleagues Carter (Bishop) and Jeannie (Brook), the latter of whom he has previously dated.