Her father is Northern Irish, originally from Belfast. Her mother has English and Scottish ancestry (one of Imogen's maternal great-grandfathers was Scottish).
Named one of the "most desirable" women for 2013 in Askmen's list of the Top 99 Most Desirable Women.
February - May 2017: appearing as "Honey" in the West End revival of Edward Albee's "Who's Afraid of Virginia Woolf" at the Harold Pinter Theatre, which also features Conleth Hill ("George"), Imelda Staunton ("Martha") and Luke Treadaway ("Nick").