What do I get her 4 her birthday HELP!? ?

I Have me best friend Antonia we are both in 8th grade we are known as the plastics in our school we have boyfriends everything we want but that's the problem I don't no wht to get her/friend she likes HOLISTER AND AREOPOSTAL but I think we have almost all there stuff and justice and her b-day party is at the rafison hotel or at the holiday in but alot of boyz are gonna be there I think I'll bye her a bathing suite idk help!! Friend problem!