You already stumped me with this ? once before it is a great one really makes you think. However I have recently changed my answer my daughter will be 16 this Sept and it is going to be my honor to work for her using her favorite flower (Lisa I know you will love this ) Hot pink gerbera daisies.
I would say Reese Witherspoon.
She's classy and chic just like all of my favorite flowers.
I'd use pink scabiosa, fragrant pink garden roses, feathery pink peonies, clouds of antique pink hydrangea, blush throated cymbids, sweet pink hyacinth, and pink ranunculus with red ti leaves rolled in an antique white washed pitcher with a pink and white grosgrain ribbon tied to the handle.
Matthew McConaughey, but only if I could hand deliver it!!!