Guys need ur help again :( It's about Selena's birthday party ;)

actually I'm planning about Selena's b.d party
I want to know any ideas 4 surprise b.d
Can u tell me some ?
I always plan b.d party 4 her but she guess some how
She'll be coming 2 my home 4 b.d party
& yeah I usually give her at least 40+ gifts
Now she'll be of 21 so I want give her 50+ gifts so I have no ideas 4 that can u plz help me in that too
The gifts should be very expensive & unique
THANK U TO ALL OF U HELPING ME ^__^