How to insert a blank page

[Lennart]

Hey,

I have a document written in the book class. I want a white blank page after 
the title page. So that the table of contents isn't printed on the back of the 
title page when I print it double sided.  I know it's against the lyx 
philosofy and I know how to fix it outside lyx. But I think it could be also 
done in lyx. I have tried \newpage \cleardoublepage pagebreak..nothing works. 
How do I insert a blank page?