updated 06/17/2010 AT 3:00 PM ET
•originally published 06/17/2010 AT 3:30 PM ET
Ugly Betty is going to make one beautiful bride!
Ferrera, 26, first met Williams at the University of Southern California when he cast her in his student film.
On Wednesday, the actress sported her new diamond on the red carpet at the Edinburgh Film Festival screening of The Illusionist in Scotland.