AI have another question. I am doing a wedding cake on Saturday. Her ribbon is made of burlap, what can I do to keep those little fibers out of the icing? Thanks so much!

Because of the fibrous nature of burlap - only faux burlap is used on cakes.  

At worst - and if you are icing in fondant, put a satin ribbon or clear acetate band under the burlap to separate it from the icing.  

If you are icing in buttercream, I would definitely go shopping for faux burlap.

Its ribbon that she ordered and had made so I feel like I have to use it - how about if I put a strip of wax paper behind it??

I wouldn't risk it, burlap is vile. You should explain for health and safety reasons you can't use it but either she can buy faux burlap or you can buy some and charge her for it etc...

Too true, the stuff is used to make sacks, but I suppose fixing acetate or gumglue to the back of it might keep those pesky fibres off the cake?