A source told RadarOnline.com: "Not only did both Anne and Adam have their parents at dinner with them, which is unusual, but the amount of enthusiasm and
excitement made it clear that they were celebrating some major news, and while everyone else sipped on wine at dinner, Anne didn't drink any alcohol, which is an indication that she could be pregnant."
The party celebrated into the wee small hours at the Picholine restaurant on Manhattan's Upper West Side and, according to the source, the actress was said to have a visible baby bump.
"It looked like there was a bump on her belly," they said.
"Anne and Adam are already engaged, so the only other good news could be a baby on the way!" The couple - who have been together since 2008 and engaged since November last year - have yet to set a date for their wedding.
Meanwhile, Anne has revealed how much fun she had playing Catwoman in the forthcoming Batman film, The Dark Knight Rises.
She told The Daily Record: “The training was really hard but it actually ended up being fun because I got to learn how to fight.
“The training had to get me to a place where I could believably defend myself against guys three times the size of me.
“I had an absolute blast. The day we finished the rooftop fight was one of the happiest experiences I’ve ever had as an actor."