The actress, who has been dating the Swiss business man since last year, was spotted wearing an enormous engagement ring at Elton John’s party in England last night (June 26), reports FemaleFirst.
A source revealed, "All the ladies were wide-eyed because the ring was so massive! It was so huge that she can’t fit it through the sleeve of her coat."
Thurman was happily surprised with Busson’s proposal, which happened during their trip to England. A friend of the couple’s stated that the pair are already planning the wedding.