Pregnant Gossip Girl star Kelly Rutherford and her husband of two years, German entrepreneur Daniel Giersch, are calling it quits, according to People.

Rutherford recently announced that she is three months pregnant.

The 40-year-old actress, who plays Lily van der Woodsen on Gossip Girl, formally filed for divorce on December 30, citing "irreconcilable differences."

Giersch filed for legal separation the same day, a source reports.

Despite the upsetting development, Kelly Rutherford is expected back on the Gossip Girl set as scheduled in New York City on Tuesday, sources report.

The couple already have a two-year-old son, Hermes. This is Rutherford's second marriage. She wed Carlos Tarajano in 2001 and divorced in 2002.

Steve Marsi is the Managing Editor of TV Fanatic. Follow him on Google+ or email him here.