Uma Thurman breaks off engagement

Uma Thurman has reportedly called off her engagement to Arpad 'Arki' Busson.

The Kill Bill star ended her relationship with the Swiss multi-millionaire on November 15, reports People.

"They remain friends," said a source.

The couple started dating in the summer of 2007. Busson reportedly proposed to Thurman last year with an 8-plus carat engagement ring, of which the source said, "She will probably give it back."

Thurman will next be seen in Percy Jackson & The Olympians: The Lightning Thief, which will be released in cinemas on February 12, 2010.