Well, this one is kinda awkward for me to answer in all honesty, because I've already met her; Tiffany Grant.
I think the next person on my list would either be voice goddess Megumi Hayashibara or AV Idol Miyabi Isshiki. If Megumi, I'd probably be speechless at first, then ask if she'd wait for me to run home really quick so I could grab my copy of Blue Seed for her to sign, and get a picture with her & the boxset. If Miyabi, it'd probably start off the same way, with a fwe seconds of silent shock, then I'd ask to get a picture with her, then ask her out on a date. (I'd be surprised if her answer would be "Yes.")