- Daughter of Marlene Dietrich and Rudolf Sieber.
- Played Marlene Dietrich's character as a child in The Scarlet Empress (1934).
- While attending boarding school in Switzerland in the late 1930s, her roommate was actress Gene Tierney.
- Called her mother Marlene Dietrich "Massy".
- Has been good friends with Carol Channing since 1949.
- Has four sons.
- Is portrayed by Josefina Vilsmaier, Theresa Vilsmaier, Janina Vilsmaier and Ute Cremer in Marlene (2000).
- Mother-in-law of Wendy Riva.
- Engaged for several months of 1943 to Richard Haydn.
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