Wish them an easy wedding planning and a joyful wedding of a lifetime and many many years of happiness 
umm so are we buying a gift or what? I can chip in a buck and extra ju-ju bees for the cause to get them something nice. they're registered at Ferarri USA and have umm... asked me to pick up the car and deliver it.
hell I'd even take an FAO Schwartz kids ferarri for 50K.
And behave yourselves on honeymoon. No swinging from chandeliers and wrecking honeymoon suite.