Wordpress plugin to make site password protected?

[IHeartHoumous]

Does anyone know of a Wordpress plugin that would make a site password protected without visitors having to register as members/create an account?

I'm building a website in WP for my wedding with all the details on it, so would prefer it not to be accessible to anyone other than those that have received an invite with website address and password to access it. I added a plugin called My Private Site but seems visitors need to register and create an account - I don't want to make it that complicated/long to view the site.

Thanks.