The gardens are manicured, the biceps are pumped. As the UK prepares for the most hotly anticipated wedding since Will and Kate's, speculation about the dress and details has gone into overdrive.

We already know that Pippa Middleton and James Matthews' nuptials will include Prince George as a pageboy and Princess Charlotte as a flower girl.

It will take place at a historic village church in Englefield, Berkshire, with a ceremony costing a whopping $470,000. The star-studded guest list includes the likes of Meghan Markle, TV star Donna Air, tennis ace Roger Federer and explorer Ben Fogle.

But what of the actual family Pippa is marrying into? Here's what you need to know about the world's (second) most famous set of in-laws.

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Pippa's wedding preparation has been well documented. Photo / Getty
Pippa's wedding preparation has been well documented. Photo / Getty