Jamie Chung finds it “rewarding” when her twins interact with her. The 40-year-old actress has two-year-old twin boys – whose names she has never revealed to the public – with her husband Bryan Greenberg and explained that their personalties are both now starting to come through as they get a little bit older. She told E! News: “It’s a different kind of toughness. It’s certainly more rewarding now that they’re interacting with you and you see their personalities shine through. Even when they say ‘thank you’ or when they start sharing their toys, it’s a really sweet thing. Like, we had somethin…