Gene Simmons Wedding Invitation; Simmons to Wed Shannon Tweed in October

KISS frontman Gene Simmons has finally set a date to marry his girlfriend of 28 years, former Playboy Playmate Shannon Tweed.

The spandex-wearing rock star, 62, will tie the knot with Tweed, 54, on October 1st at the Beverly Hills Hotel. The couple have two grown-up kids, Nick, 22, and Sophie, 19.

Simmons and Tweed have already sent out invitations -- with a hilarious wedding announcement from their kids.

The announcement says, "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."

The invitation requests for a"classy cocktail attire," adding "although we know some Rockstar attire will be worn."

The invitation also includes family portrait of Simmons, Tweed and their two kids with the following message:

"But we will be united as a family in spirit and in title forever. There will no longer be a Team Tweed or a Team Simmons but instead a Team Tweed-Simmons and as annoyingly long as that is, we hope you're on it."

Simmons, who once claimed in an interview that he had slept with nearly 5,000 women, proposed to Tweed on his A&E reality show, "Gene Simmons Family Jewels."

Playmate Of The Year in 1982, Shannon previously had a brief relationship with Hugh Hefner.