Uma Thurman and Arpad Busson
07/10/2008 AT 07:25 PM EDT
Uma Thurman and her Swiss multimillionaire fiancé Arpad "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.