Great news: We’re going to be chatting with Emma Roberts on Twitter (@StyleWatchMag) this Thursday at 4:30 p.m. ET. Greater news: You’re invited! Greatest news: It’s all for a fabulous cause. The actress is helping announce the launch of (THRED), a new mobile game that aims to help end mother-to-child HIV transmission by 2015. The app features music by Tiësto, and it’ll be featured on an MTV special in the weeks ahead, too. But in addition to the cause, Emma is happy to chat about all things Hollywood, like fashion, beauty, her upcoming movies and more. So if you have a question, leave it in the comments; she might answer tomorrow!