KISS rocker Gene Simmons 62, is FINALLY making an honest woman out of his Playboy Playmate Shannon Tweed 54, after being together since 1983 (28 freaking years!) and having two children together: Nick, 22 and Sophie, 19 .

The kids got together and created their wedding invitation which is both sarcastic and lovely:

“After 28 years of loose strings, our parents have finally decided to tie the knot.”

“Our mother will share our horrendous hyphenate of a last name and our father’s life … well, it doesn’t change that much.”

And the lovely part:

“But we will be united as a family in spirit and in title forever.”

I think that’s very sweet, although regardless of a wedding ceremony they would have been family in spirit forever. Shannon has been wanting to get married FOREVER, but Gene was very gun-shy about the whole ordeal. They will finally become man and wife on October 1 at the posh Beverly Hills Hotel assuming Gene doesn’t scurry away like a little sissy-bitch.

They request that ‘classy cocktail attire’ be worn but they fully expect ‘Rockstar attire will be worn’.

It’s really kind of cool to have the adult children part of the wedding-planning process!

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Photo: Fayes Vision/WENN