The duo, who have been romantically linked since summer, made their red carpet debut as a couple, at the screening of "Girl on the Train" in New York, reported Aceshowbiz.
The film stars Prepon.
The 36-year-old actress showed big smile as she flashed her diamond ring on red carpet Tuesday, October 4.
Foster, 35, was previously in an on-and-off relationship with Robin Wright before they split for good last year. Prepon's famous exes include Christopher Masterson and Scott Michael Foster.
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