Lark Previn died Christmas Day at a Brooklyn hospital, the medical examiner's office said. No cause of death was given. A cremation was held Tuesday at Brooklyn's Green-Wood Cemetery.
Born in Vietnam in 1973, Lark Previn was one of three children adopted by Farrow and her then-husband, conductor Andre Previn. The couple also had three biological children.
Farrow adopted two more children and had a biological son with Allen. She subsequently adopted several children as a single woman, bringing the total to at least 14. A daughter, Tam Farrow, died in 2000.
Farrow starred in several of Allen's movies during their relationship, which ended in 1992 when she discovered he was having an affair with her oldest adopted daughter, Soon-Yi, then 22.
The bitter custody battle that followed featured accusations by Farrow that Allen had sexually abused adopted daughter Dylan, 7. Allen was exonerated of the abuse charges, but Farrow won sole custody of the children.
Soon-Yi Previn married Allen, who is 35 years her senior, in 1997. They have two adopted daughters.
The Farrow-Allen custody fight featured court testimony that Farrow favored her biological children over her adopted children, including Lark Previn. A movie producer testified on Allen's behalf that Lark Previn was viewed as a "scullery maid" who "did most of the chores." Farrow's supporters said she was a loving mother to all her children.
Representatives for Farrow, Allen and Andre Previn did not immediately return calls seeking comment Tuesday.