The Silence of the Lambs star has been linked to photographer Alexandra Hedison, who dated DeGeneres for three years until they split in 2004.
According to E! News, the pair has been dating since the beginning of the summer (13).
A source says, "It's pretty serious. They're totally in love."
Foster finally confirmed longrunning speculation she is a lesbian in January (13) at the Golden Globe awards when she was presented with the prestigious Cecil B. DeMille award.
She used her acceptance speech to thank her ex-partner Cydney Bernard, with whom she has two sons, Charles and Kit.
Foster said, "There is no way I could stand here tonight without acknowledging one of the greatest loves of my life. My ex-partner in love but righteous soul sister in life, my most beloved Bff (best friend forever) of 20 years, Cydney Bernard. I am so proud of our modern family."