Pippa Middleton’s family is gearing up for her wedding day! The Duchess of Cambridge embraced her role of the supportive big sister visiting the bride-to-be at her West London home on Thursday. Kate Middleton was spotted leaving her younger sister’s house, where the stylish siblings no doubt discussed last-minute wedding plans. The royal mom-of-two, 35, was dressed casual for the April 6 outing wearing a white cable knit sweater and skinny black jeans, which she paired with white Superga sneakers. The sisters’ mother Carole Middleton visited her youngest daughter earlier in the day with milliner Stephen Jones.

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VER GALERÍA The Duchess visited her sister at her London home Photo: Getty Images

The Duchess’s recent visit comes a few days after she and Prince William dined at Pippa, 33, and her fiancée James Matthews’ home. The British royals enjoyed a low-key dinner with the engaged couple and James’s parents — David Matthews and Jane Parker — in addition to his Made in Chelsea star brother Spencer Matthews.

GALLERY: EVERYTHING WE KNOW ABOUT PIPPA'S WEDDING

While details of the wedding are being kept under wraps, HOLA!’s sister brand HELLO! previously revealed that James and Pippa will say 'I do' on Saturday, May 20. The couple will tie the knot at St. Marks' Church in Englefield, Berkshire, followed by a reception held at the Middleton family home in Bucklebury.

VER GALERÍA Kate celebrated Pippa's bachelorette party in France Photo: Getty Images

Last month, Kate celebrated her sister's impending nuptials with a bachelorette party in Meribel, France. A friend of the bride-to-be told the Sun: "Pippa loves skiing so it was her first choice for a hen weekend. They stayed in a really exclusive catered chalet with maids and a chef, who ensured that they were totally spoilt. The owners also wanted to impress their royal guests so the girls were showered with gifts. They were given Swatch watches, Ugg slippers, leather-bound notebooks and bespoke fragrances. It was a very small, private party and they had an amazing time."

It is believed that Kate will play a pivotal role on Pippa's big day, but she will most likely not return the favor of serving as her sister’s maid of honor out of fear of stealing the spotlight from the bride. However, because she is used to public speaking, it is possible that the Duke's wife may do a reading during the service. Meanwhile, it's believed that her son Prince George will serve as a page boy or ring-bearer, while her daughter Princess Charlotte will be a flower girl.

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