Teresa "Baby" Jungman (9 July 1907 – 11 June 2010) was the younger daughter of Dutch-born artist Nico Wilhelm Jungmann. Along with her sister Zita, she was one of the "Bright Young Things" in the 1920s.
Jungman's father was a naturalized British subject who, in 1900, married Beatrice Mackay, from a devout Roman Catholic family in Birmingham. They were divorced in 1918, after he had been interned in Germany because of his British citizenship. Nico died in 1935. Teresa’s mother, a notable hostess, then became the second of three wives of Richard Sidney Guinness (1873–1949), one of the banking Guinnesses, and a paternal uncle of Thomas "Loel" Guinness. Beatrice was later killed in a bombing raid in the Second World War.
The novelist Evelyn Waugh was greatly taken by Jungman but his affection was unrequited, partly because she was a devout Catholic and he was divorced from his first wife. He met her in 1930, proposed to her in 1933, and was turned down. She was possibly the source for Lady Julia Flyte in Brideshead Revisited. She was also admired and photographed by Cecil Beaton. Jungman had many admirers during the 1920s and 1930s, including Lord Margesson, the Conservative Chief Whip; the 4th Lord Ebury (1883–1932), of the older generation; Lord David Cecil (1902–1986); “Bloggs” Baldwin (son of the Prime Minister); and the 7th Earl of Longford (then Frank Pakenham). Another admirer was the 9th Duke of Marlborough, whose second wife Gladys Deacon nearly cited Teresa in a divorce application. However, Teresa married a Scottish-Canadian sergeant-major Graham Cuthbertson in 1940 and had two children, Penelope and Richard. Cuthbertson soon left her, her son Richard died in a car crash in 1965 while her daughter Penelope became second wife of Desmond Guinness.