Debra Messing Files for Divorce From Daniel Zelman

Writer/producer Daniel Zelman (L) and actress Debra Messing arrive at the 61st Primetime Emmy Awards held at the Nokia Theatre on September 20, 2009 in Los Angeles, California.  Frazer Harrison/Getty Images

There's nothing messy about Debra Messing's divorce proceedings.

The Smash star, 43, filed papers Tuesday asking a judge to end her nine-year marriage to actor and TV producer Daniel Zelman, E! News reports. The actress is seeking joint physical and legal custody of their 8-year-old son, Roman.

Messing — who met Zelman at New York University in the '90s and tied the knot in September 2000 — listed their date of separation as February 15, 2010; the spouses continued to live together until early 2012. When Us Weekly broke the news of their split in December 2011, a rep for the New York-based couple explained that they would "gradually transition into a new living situation."

Though Messing has since moved on with her Smash costar Will Chase, 41, her impending divorce still weighs heavily on her.

PHOTOS: Are these stars better after breakup?

"Twenty years. It's a very long time," the Will & Grace alum recently told Ladies' Home Journal. "I think the institute of marriage is a noble thing. I think the idea of a partner for life is incredibly romantic. But now we're living to 100. A hundred years ago people were dying at age 37. Till death do us part was a much different deal."

Messing added that she's beginning "a new chapter in my personal life" and "walking a path I've never walked before." Fortunately, she and Zelman are still on good terms.

"Every thought is dictated by what's best for our son. [Daniel and I] are completely on the same page in that regard. We are dear friends. And I am at peace with the journey we've had," she told Ladies' Home Journal. "I feel like the 20 years we had together has been a huge success. And despite the fact that everything is changing, I think everyone is thriving."

Sign up now for the Us Weekly newsletter to get breaking celebrity news, hot pics and more delivered straight to your inbox!

Want stories like these delivered straight to your phone? Download the Us Weekly iPhone app now!