The 44-year-old actress wowed as she attended the 2013 NYC Dance Alliance Foundation Gala at the NYU Skirball Centre in New York City on Sunday evening (29 September).
Catherine has been keeping a relatively low profile since news broke earlier this year that she and husband Michael Douglas were taking some time apart.
In August a rep for the couple confirmed to Reveal: "Catherine and Michael are taking some time apart to evaluate and work on their marriage."
The actors, who have been married for 13 years, have two children together: Dylan, 13, and 10-year-old Carys.
Catherine was noticeably wearing her wedding ring at last night's event, where she was the guest of honour. Of course, she's no stranger to dance having won an Oscar for her role in Chicago.
Rumours of a reconciliation with Michael have been floating around this week after a source told the new issue of People magazine that the couple are "not giving up " when it comes to their marriage and are determined to work through their issues.
Michael has also been wearing his wedding ring lately, and recently denied claims the marriage was in "crisis".
The 69-year-old told journalists in Berlin earlier this month: "We are fine. My wife and I are fine. [It is a] temporary separation."