We're already pretty smitten with Kristen Stewart, and we just love it when we catch her smiling like this! Of course, Dakota Fanning is definitely one of our fav up and comers as well - she's already got an acting resume that could knock the socks off of most twentysomething wannabe starlets in this town!

We JUST snapped the New Moon (and The Runaways) co-stars leaving a studio in Hollywood, and it looks like the two teenagers were having a serious giggle! We're not exactly sure what sort of business they were doing in the studio (we do know it's related to the pre-production for the Joan Jett biopic), but clearly these ladies had a blast working together!

Or perhaps Kristen is just twitterpated because she's thinking about her other co-star slash lover?