were photographed kissing after a dinner together at a restaurant in Beverly Hills, California.
Thurman, 44, looked stunning in a white dress for the night out with a matching coat. While saying their goodbyes, she and the 51-year-old director leaned in for a kiss and an embrace, reports Us magazine.
The Kill Bill collaborators are expected to have taken their relationship to the next level after being friends for more than a decade. They even shared a villa while attending the 2014 Cannes Film Festival in the South of France.
Read: Is Uma Thurman dating Quentin Tarantino?
"They had a thing and got together again recently. He's loved her for years.
"There has always been an attraction. She has indulged from time to time, and that's how their relationship has always worked," a source said.
In April, Thurman called off her engagement to hedge-fund mogul Arpad "Arki" Busson, with whom she shares 22-month-old daughter Rosalind Arusha Arkadina Altalune Florence Thurman-Busson.
Tarantino was most recently linked to costume designer Courtney Hoffman.