Gene Simmons has officially wed his longtime girlfriend, Shannon Tweed!

The two finally got hitched on Saturday in Beverly Hills. The KISS rocker and former supermodel were joined by more than 400 guests (we're betting no one wanted to miss the chance to see this actually go down), including Hugh Hefner and Bill Maher.

The evening was filmed for the couple's A&E reality series, Gene Simmons' Family Jewels. Seems they're taking a page out of Kim Kardashian's book; a special wedding episode will air later this month.

Simmons, 62, proposed to former Playboy Playmate Tweed, 54, with a 24-carat diamond. They've been together for 28 years and have two kids -- Nick, 22, and Sophie, 19.

Rock legend Gene Simmons, Carmen Electra and her hubby Rob Patterson came out last night to celebrate the launch of "Guitar Hero: Warriors Of Rock" at Paramount Studios in Hollywood last night.

He may be more "showtunes" than rock, but Glee's Mark Salling even showed up for the event:

Reminds us of how much we're looking forward to the Glee "Britney/Brittany" episode tonight!

Gene Simmons stopped by Borders last night to launch his new book "Ladies Of The Night" - and posed with a few loyal soldiers from the KISS Army while he was there. He may be "the Demon" in KISS - but he's an angel around his fans!