16th Birthday Party

My daughter has decided for her 16th birthday party to have an......

ALIEN Theme, not jewelry, tiaras, flowers, nothing like that, but aliens from outer space.

Only my daughter could come up with something like this.

We did the invitations today. Here is what the invitation states:
Earthling(s)
You are invited to the
Homosapien Extermination Project (this has a line through it)
16th Birthday Party
For
XXXXXXX
Hosted by the invading (Invading has a line through it)
Nice alien forces
At the house with the space ship
hovering over the yard

We are going to hang planets from the ceiling, place alien posters on the wall and put black gossamer star material on the walls. If any one has any other suggestions they will be appreciated