Catherine, 44, dazzled in a plunging, silver couture gown to be honoured at the NYC gala where she received their prestigious Ambassador for the Arts Award.
The Chicago star, whose curvaceous figure appeared more slender than usual, sparkled in the floor-length, sequin-adorned dress. Her brunette locks were sleek and straight, and a smoky eye and red pout completed her striking look.
Catherine, who is currently "taking a break" from her husband Michael Douglas after 13 years of marriage as the couple "work things out", also donned an important accessory.
In a show of solidarity with Michael, who recently celebrated his 69th birthday on the same day that she celebrated her 44th, the mother-of-two wore her wedding ring.
The duo usually celebrate their birthdays, which both fall on 25 September, together.
This year was the exception as they work through their "issues".
While the Hollywood couple remain physically apart – they haven't been photographed together since April – the pair are in regular contact and speak several times a day, and according to reports, are on the road to reconciling.
Michael recently attended the 2013 Emmy Awards without his wife of 13 years by his side, but that didn't stop him from making a tribute to Catherine in her absence.
As he stood on stage to accept the Emmy for the best actor in a movie or miniseries for Behind the Candelabra, the Oscar-winning actor said: "I want to thank my wife Catherine for her support, my kids Dylan and Carys, and a shout out for my oldest son Cameron and hoping I'll be able and they'll allow me to see him soon."
On the red carpet, he spoke openly of his hopes to reunite with Catherine.
"I'm very hopeful that we're going to work things out," he said.
"As I said we're just taking a break, a couple of issues, sometimes you got to do that."