The Kill Bill star announced plans to marry the London-based multi-millionaire in 2008 after a year of dating, but they called the romance off in November (09). However, rumours started making rounds that the actress has reunited with Busson after they were spotted enjoying an intimate date in January (10).
And Thurman proved her reunion with Busson during an outing in London's Hyde Park to support his son at a school sports day - where his former supermodel lover was also in attendance.
The trio put on a united front during the day out, with snappers catching Macpherson and Thurman chatting to one another, reports the Daily Express.
The Australian beauty has two sons - Arpad and Aurelius - with the businessman. The pair was engaged in 2003 but went their separate ways in 2005.