Not that I am aware of. But according to art. 113 of the Belgian constitution people married into the royal family can only get the title HRH Prince(ss) X of Belgium by a royal decree. There were royal decrees for Mathilde, Lorenz and Claire. It is unlikely that they will do that for Elisabetta, so my guess is that she will 'use' her husbands title out of courtesy, so HRH Princess Amedeo, just like Princess Alexandre (Léa Wolman) is used.
It will be interesting to see what title their children will get. With the downsizing trend at various courts I think it is unlikely that they will become HRH Princes of Belgium too, as it means that in the next generation there may be 100 people with such a title around. However, under the current law, all legal descendants of King Albert II are entitled to such a title.
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And back to the wedding: according to VTM the service will be in the Santa Maria in Trastevere basilica.
Pictures:
https://www.google.nl/search?q=Sant...Qi9Q8hcuB2Aw&ved=0CAkQ_AUoAg&biw=1029&bih=668