Be there when they need it, gather together a list of family and family friends for your side - everyone you can think of, and if you're ambitious, sort it into "must invite" and "could invite" and "only if you're lacking bodies to invite" for him. Asterisk females if they are having a girls-only bridal shower.

Ask Nicole when they have settled on colors for the wedding to let you know, and shop for your dress according - you needn't match, you just shouldn't clash!

Ask Nicole if there's anything you can do to help, and be gracious if she says "No, thanks!"