12/10/2008 05:12 am ET Updated May 25, 2011

Angelina Steps Out, Says Twins Getting "Smiley"

Actors Brad Pitt and Angelina Jolie's twins may be only four months old, but they're already characters of their own.

"They're great. They're still so little, but they do [have their own personalities]," Jolie told reporters at the DVD launch for Kung Fu Panda and the premiere of its companion adventure story, Secrets of the Furious Five in Hollywood on Sunday.

Knox and Vivienne are "starting to get very smiley," their proud mom said. "They're at that [stage] where their personality really starts to shine."

As for the rest of the brood, they share a love of their mom's work. "I think it's a great film, and it's brought a lot of joy to children - and to my children, absolutely," Jolie told PEOPLE at the event.

Read more on People