A tabloid's access to celebs often depends on whether their publicists are willing to schedule in a chat between soul waxings. Or at least that's People's M.O.

Over at Wenner rag Us Weekly, it's the paparazzi (also known as "friends" of celebs) who are the best sources. Which might explain why Us is so loose with its insider information when it comes to the lensmen it so heavily relies on.

So just how loose is the Us ship when it comes to the that prized asset called "access?" Perhaps the answer lies in a tale we like to call "Screwing Tori Spelling."

On Monday, Spelling's husband Dean McDermott became enraged when he found his secret hideaway for newborn Liam discovered by the paps, thanks in no small part to the loose lips of Us.

Dean "looked out his window ... to see two paparazzi SUVs staked out in front of what he believed to be a very secret residence of where he, wife Tori Spelling, and baby Liam (almost 1 month) have been staying in Beverly Hills since a bit prior to Liam's birth," says an industry veteran.

Screamed Dean: "How did you find out about this? Who told you?"

To which the paparazzi replied: They got a tip from someone at Us about where he was staying.

Which would make sense, given that Us just did a photoshoot on Saturday with Dean, Tori, and Liam for the issue that hit newsstands today.

As you might imagine, Dean was none too pleased about the breeched confidentiality between his fam and the tabloid. But he'll have that tidy "appearance fee" cheque to help quell his anger.