Yes, Denise Richards did spend over 40 episodes on 'Real Housewives,' and she turned out to be an interesting addition to the cast. Even if many former fans of the show claimed they hated her on it. Either way, Denise didn't originally didn't make the cut.

At least, that's what insiders say about the reality TV starlet. The question is, says who -- and why?

Denise Richards Was Originally 'Blacklisted' From 'Real Housewives'

Insiders suggest that while Denise Richards eventually made the cut, she was first on a veritable blacklist of celebs who didn't qualify for the show. That's right: someone didn't want Richards on the series at all.

Fans discussed numerous theories and tidbits of gossip about Richards and 'RH' on Reddit, and the hints are telling. First off, a ghostwriter who apparently penned a book for Housewife Erika Girardi is the one who spilled the beans.

Taking the leak with a bit of salt, fans do presume that there's some truth to author Brian Moylan's reveal. Like the fact that a "forever no" list exists in the 'Real Housewives' universe. After all, producers must have some people they don't want on their show... Right?

RELATED: Here’s How Fans Really Feel About Denise Richards’s Time On ‘RHOBH’

Insiders say that there is such a list, although it doesn't really mean "forever," since Denise did wind up being cast. The premise of the list is that there are certain personalities that don't qualify for 'RH,' for whatever reason.

The inside source says that it might be people that the casting directors had formerly interviewed, even multiple times, but ultimately passed on. The reasons for passing on a potential candidate? They're either too boring, or they're "too much of a mess or are not good for television."

Was Denise Richards 'Too Much Of A Mess' For Reality TV?

What fans (and detractors) of Denise Richards want to know is, which reason did the producers give for not wanting the housewife on the show in the first place. Did they think she was a complete mess, or not good for TV?

As it turns out, Denise Richards was rumored to be blacklisted for being too boring. The casting directors interviewed her, so says Girardi's ghostwriter, but thought she was too blah for TV.

Later, however, Bravo specifically asked for Denise, apparently having had a change of heart. And as Moylan summed up, it turned out well; "It ended up being two seasons of pure gold – so thank you."

What Other Potential Housewives Have Been Blacklisted?

Moylan had some other details to reveal, too: what other celebrity women have been blacklisted from appearing on 'RH'?

Allegedly, big names like Nicolette Sheridan, Lori Laughlin, and Heather Locklear are specific names that a casting agent confirmed are on that 'forever no' list.

Which is a bummer, fans sighed, because wouldn't Lori Laughlin's legal drama have made for good reality TV?

NEXT: Denise Richards Would Return To RHOBH… On One Condition