Will princess Martha Louise wear a tiara tomorrow and if so will it be her own tiara or will Queen Sonja loan her another piece?

What about the other royals attending?

As far as i can find these royals are expected to attend:

TM King Harald and Queen Sonja
TRH the Crown prince and Crown princes
TRH Princess Ingrid Alexandra and Prince Sverre Magnus
HRH Princess Astrid
TRH Crown princess Victoria and prince Daniel of Sweden
TRH prince Carl Philip and princess Sofia of Sweden
TRH prince Constantijn and princess Laurentien of the Netherlands
HRH princess Alexia of Greece and Denmark