“The gardens are beautiful and she can’t wait to have her wedding pictures done surrounded by her nearest and dearest.
"They are going all out for the wedding. And their families are tickled pink by the Winston Churchill connection.”
The legendary World War II Prime Minister was born in 1874 at the posh property, which dates back to the 18th Century.
But Rochelle might want to cover up on their big day, in case her tattoo of their initials bring down the upper-class theme.
The Saturdays star got their initials 'R' and 'M' inked on her body in a swirling design in April.
Marvin proposed on a luxury holiday in the Maldives in December, and Rochelle has gushed about how the engagement has brought them closer.
She told Hello! magazine: "From the moment I slipped that engagement ring on Rochelle's finger I've felt a tighter bond with her. I assume marriage will make that closeness even greater."
> IN PICS: CELEBS CAUGHT ON CAMERA
Caught On Camera(01 of14)
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Charming! Kristen Stewart let's her Snow White and the Huntsman co-stars Charlize Theron and Chris Hemsworth know exactly what she thinks (credit:WENN)
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Keith Lemon tries his best to grab some of the attention away from the divine Miss Brook. Fails. (credit:WENN)
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Looks like Jessie J's just found those photos from last night, then (credit:WENN)
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'I am NOT, hic, dwunk'. Joey Essex looks less than impressed at cousin Chloe Sims (credit:WENN)
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'Oh you really shouldn't have.' The Wanted's Siva looks overjoyed at his furry gift (credit:WENN)
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Looks like Denise Welch has just flashed her boobs at fellow Loose Woman Carol McGiffin (credit:WENN)
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Errrm, Louie, we don't care if you're gay, that's still a no-no (credit:WENN)
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Who needs a guiding hand to lead you to your car after a night on the lash when a flunky's hair will do, eh Rihanna? (credit:WENN)
Caught On Camera(09 of14)
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Jamie Winstone should've gone to SpecSavers (credit:WENN)
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'Why didn't you go before we left the house?' Nicole Scherzinger, like, REALLY needs the loo (credit:WENN)
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'Where's me keys? Where's me phone?' Kimberley Walsh swears they're in there somewhere (credit:WENN)
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Who knew Charlize Theron was such a big fan of Blue? (credit:WENN)
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TOWIE's Mario is determined to get his leg over (credit:WENN)