Older sib Felicity was set up on a blind date with Tucci by her sis, and clearly things went well.
"Stanley is very happy with her," a source close to the couple observed.
Tucci's previous wife, Kate, died in 2009 after a battle with cancer. Stanley has three children from that marriage -- twins Isabella and Nicolo and daughter Camilla.
Dates are unsure, but when the "I do's" are all done, Tucci will land Emily's husband, John Krasinski of "The Office," as a brother-in-law.
Stanley Tucci engaged to Emily Blunt's sister Felicity
