'Gotham' Stars Ben McKenzie, Morena Baccarin Show Off Baby Bump on Red Carpet [Photos]

Although they were originally tight-lipped about their relationship, “Gotham” stars Ben McKenzie and Morena Baccarin have gone public about it, and have shown a baby bump on her.

Entertainment Tonight reported that the couple have been seen at the red carpet, while attended the Sierra Club's Act in Paris, A Night of Comedy and Climate Action event at The Heath at The McKittrick Hotel in New York City. Baccarin was seen with a baby bump. Her pregnancy has been reported earlier in September.

Unnamed sources reported that the couple arrived hand in hand, with 37-year-old McKenzie holding 36-year-old Baccarin's coat as the cameras took shots. Her baby bump was clearly visible in her form-fitting dress, while her seemingly comfortable boyfriend wrapped his hand around her.

ET added that they sat front row surrounded by Gina Gershon, Lucy Lawless, Jill Hennessy, AnnaSophia Robb, Robert De Niro, Cuba Gooding Jr, and McKenzie's “Gotham” co-star Erin Richards.

“She and Ben are very happy about this news,” an unnamed source told People of Baccarin’s pregnancy. “Everyone is very excited.”

Despite the beaming smile that she had on her face, Baccarin is still in a legal battle with her ex-husband Austin Chick, over their two-year-old son Julius.

Last September, she filed for full custody of her son as Chick resides in Los Angeles, and she wouldn't be able to travel back and forth due to her pregnancy. A ruling was given in her favor.

After their split over the summer, Chick reportedly "shipped some furniture [to NYC] and actually stayed there with the child for approximately two weeks in July."

Baccarin said that for “medical and financial reasons” it would be easier for Chick to travel, compared to her. Julius was to stay for eight days in California every two months to visit his father.

However, after learning that Baccarin “had a new boyfriend” (McKenzie), he “changed his mind” and decided to return to LA with his son.

Chick was surprised that they had more than professional relationship.

"Austin was totally shocked when he found out about the affair," an unnamed source told ET. "Totally blindsided. When Morena left him for Ben, Austin was devastated -- completely shocked."

In Touch Weekly reported that their dating started when Baccarin was still technically married to Chick. Recently, they announced that they are planning to marry.