Graduated, LAMDA Three-Year Acting Course, 2008.
She is of Scottish, English, Welsh, 1/8th Mexican, and more distant Irish and French Huguenot, descent (Rose's paternal great-grandmother, María de la Luz de Landa Osio, was from a wealthy Mexican family). Rose is a descendant of New Zealand politician Frederick Weld; Charles Clifford, 6th Baron Clifford of Chudleigh; Ambrose Lisle March Phillipps De Lisle, who founded Mount St. Bernard Abbey; politician Charles March-Phillipps; Simon Fraser, 13th Lord Lovat; and James Grimston, 3rd Earl of Verulam; and other prominent leaders in the British Empire.
Is descended from Charles II of England (1630-1685), who was King of England, Scotland, and Ireland, from 1660 to 1685, and King of Scotland, from 1649 to 1651. Actors Kit Harington and Dacre Montgomery are also descended from Charles II, and are therefore Rose's distant cousins.
(June 23, 2018) Married her on-off boyfriend of 6 years Kit Harington in a romantic ceremony at Kirkton of Rayne church in Aberdeenshire, Scotland following a 6-month-long engagement, and the reception was held at nearby Wardhill Castle, which is owned by Leslie's family. Game of Thrones (2011) co-stars Peter Dinklage, Emilia Clarke, Sophie Turner, and Maisie Williams were in attendance.
5th cousin of actress Olivia Wilde through Scottish nobility.
Born on the same date as Michael B. Jordan.
Announced her first pregnancy with husband Kit Harington in the September issue of Make Magazine (September 2020).