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.

Chris Kattan married model Sunshine Tutt in Yosemite Valley, Calif., on Saturday.

The former Saturday Night Live cast member, 37, started dating Tutt, 31, in the spring of 2005 after meeting her at a birthday party. He proposed on Christmas Eve 2006 at her grandparents’ home in Gainsville, Texas.

Uma Thurman is engaged to her Swiss multimillionaire boyfriend, Arpad “Arki” Busson, her rep confirms.

“I can confirm she is engaged,” Stephen Huvane said on Friday. New York’s Daily News was first to report the engagement.

In return for saying yes, the actress received some serious sparkle: an 8-plus carat center stone surrounded by 20 smaller stones. “It’s the most beautiful piece I’ve ever seen,” says a close source of the diamond ring. “Arki did a wonderful job.”