The outlet claims that Pippa has completed a "strict bridal body boot camp", a three-month program run out of Grace Belgravia health club. For brides, the practice is becoming increasingly common, the New York Times reported previous year.
So from everything we've heard, Pippa Middleton's wedding dress is going to be a stunner.
Pippa's niece and nephew, Prince George and Princess Charlotte are said to have roles in the ceremony as page boy and flower girl, while the Duke and Duchess of Cambridge will of course be in attendance.
"Pippa has met with her personal trainer about five times a week and mostly sticks to cardio and pilates", as source tells E!
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That's right, everyone, the time is near-the week we have all been waiting for is upon us: Pippa Middleton is set to marry James Matthews this weekend in London. Now that the big day is just around the corner, a source has revealed some juicy details about the design of her gown, hinting that when it comes to the fashion department, Pippa will not disappoint. She is reportedly asking her guests two things. "Kate would want to be in the background as much as possible".
Duchess Kate's little sister also wants those attending her wedding to bring a second outfit for the evening reception. The request can certainly be onerous, with the Telegraph pointing out that it's "hard enough to nail the flawless one outfit for a high profile society wedding".
Famous guests, in addition to Kate and William, will reportedly be Prince Harry, Meghan Markle, Ben Fogle and Roger Federer.