What rhymes with luvvie?

Nothing really rhymes well with loveth. You could use "loves" instead though, unless you are using archaic speech for a specific reason. If not, try these rhymes for loves:

doves

gloves

It is still not many, but more possible. :)

Another thing you could do if you really need "loveth" in your poem is to change the Word order. Try to move loveth to the middle of the line, and rhyme a different Word at the end.