What do 15 year old girls want for Christmas?

[ksrwr]

I need to get something for my DD's Godfather's daughter. bit random. but they LAVISH gifts on my DD, so i need to get them something in return.
Problem is she's just about to turn 15, and is pretty "cool" for her age, and i have ZERO idea what is cool these days - according to teenage girls.
short of getting her some shopping vouchers, can anyone advise me on a good xmas present for a 15 year old girl? thank you!

Benefit makeup? Or is there a new overpriced fashionable brand now?

Jack Wills stuff is popular with teens.

My DD (13) prefers money or vouchers.

Cinema vouchers is my failsafe present for teenage nephews/nieces and godchildren.

www.mumsnet.com/Talk/Christmas/1608250-15-year-old-girl-Im-stuck

thank you so much for the suggestions - and thank you for the link to the previous exact same question... i had a look through all the christmas chats.. and hadn't seen that.
thanks all!