07/02/2012 at 03:30 PM EDT
For Katie Holmes
, the show must go on.
The actress, who on Friday filed for divorce
from her husband of five years, Tom Cruise
, kept her previously scheduled Monday appearance on the Lifetime reality fashion competition Project Runway: All Stars
, PEOPLE has learned.
And according to judge Isaac Mizrahi, Holmes, who appeared as a guest judge, was a nice addition to the show. "She did great," he told PEOPLE after the taping.
Added a source: "She was engaged, articulate and wonderful!" The show tapes at Parsons The New School of Design, whose fashion school is located in New York City.
Project Runaway: All Stars
is a spin-off of the original Project Runway
, which will begin airing its 10th season July 19
The first-season finale
of All Stars
was held last March. The winner – as judged by Angela Lindvall, Georgina Chapman, Mizrahi and guest judges Tommy Hilfiger and Neiman Marcus fashion director Ken Downing – was Project Runway
season 8 contestant Mondo Guerra.
Reporting by CATHERINE KAST