Uma Thurman and her Swiss multimillionaire fiancéArpad "Arki" Busson announced their engagement on June 28 – and they are still celebrating the good news.

　　On Wednesday, the pair's close family and friends came together for a formal party at Thurman's Manhattan apartment.

　　In the days after their engagement, they also celebrated with friends in Saint-Tropez, and had another party in London where Busson is based.

　　"I have never seen her as thrilled. She looks amazing," says a source. "She is surrounded by tons of happy friends."

　　Up next for Thurman, 38, and Busson, 45: They've set off for the Mediterranean island of Corsica for more sunshine and a little scuba diving. "She deserves it," says the source.