Heidi & Spencer -- 'Til Death...

4/17/2009 10:40 AM PDT

Heidi & Spencer -- 'Til Death...

So now we know why Heidi and Spencer went to the Bev Hills Courthouse on Wednesday. They said they didn't get a marriage license -- pants on fire.

We've learned that's exactly what they did. It's under seal, but it's real. And they're getting hitched a week from Saturday.

All invited guests will receive 10 copies of Heidi's latest single ... this part we're guessing, but it's a safe bet.

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