If you do weddings, common knowledge is that you need 2 bodies. It's more convenient (less lens swapping) but more importantly, if one body 'dies', you have at least another body to fall back on.
Another K50 might be a better option as the controls are the same. But I see in your profile that you have a K10D as well, so this might not apply.
As people seem to be happy with your photos, I would opt for other equipment. Flash, diffusers, extra memory cards, tripod etc come to mind; your call based on need
Lenses are not that important in that case (they deliver what the customer expects) but if you decide to go that way a Tamron 28-75/2.8 (or similar) would be a nice universal lens.