Because the bridal couple are the stars of the invitation, their names are set off, on separate lines. The preposition linking them goes on its own line: traditional American formatting uses the word "to"; some Jewish formats use the word "and."
If the bride's last name is the same as her parents' above, it is not repeated. No courtesy title (such as Miss or Ms.) is used.
If the couple or both sets of parents are to host, treat the names equally.