Being young, beautiful, fabulous and in love sure can cause a person to work up an appetite. Just ask Joe Jonas and Ashley Greene. The lovebirds (and future married couple?) fueled up after an exhausting day of hand-holding and staring into each other's eyes on Wednesday by hitting up hot Hollywood eatery Katsuya. Which is a step up from the Twilight beauty's usual fare. Hit up the photo gallery to join the enchanted duo on their dinner date. And in case that's not enough Ashley Greene goodness for you, hit up our big, juicy photo gallery of the actress' sexiest looks...