Kate Middleton is a supportive sister to bride-to-be Pippa Middleton. The Duchess of Cambridge was spotted visiting the latter again, who is currently busy with her wedding preparations.

On Thursday, Kate was spotted in Pippa’s home in London. In the photos shared by Daily Mail, Kate kept it casual by wearing a cable knit jumper and black skinny jeans. She appeared to be on-the-go because she was not on her signature heels but wore a pair of Superga sneakers instead. In one photo, Kate seemed to cover her face with her phone.

The Duchess of Cambridge’s visit to Pippa happened just hours after their mother Carole Middletton paid a visit to the bride-to-be with milliner Stephen Jones. Many believe that the family is on their last-minute preparations for Pippa’s upcoming wedding.

READ: Kate Middleton attends Pippa Middleton‘s bachelorette party while Prince William misbehaves in a separate ski trip

Last week, Prince William and Kate were also spotted in Pippa’s home with her future in-laws. It was not clear if Pippa’s fiance James Matthews was there, but his brother Spencer Matthews, their dad David Matthews and his wife Jane Parker were in attendance.

The Duchess and Duke of Cambridge dressed casually for the occasion. Kate looked chic and elegant on her floral print dress, which she matched with a pair of black heels. William, on the other hand, donned a blue shirt with rolled-up sleeves and black trousers. The dinner reportedly lasted for over three hours, but they had a great time.

“They all seemed very happy and relaxed,” an onlooker told Mirror. “William was smiling and chatting to Kate as they walked to their car. It looked like that had a good evening.”

Pippa and James’ wedding is set on May 20. The couple will tie the knot at St. Mark’s Church in Englefield, Berkshire. Kate and Pippa attended services there when they were kids. The wedding reception will take place at the 18-acre Georgian Grade II-listed manor home of the Middletons, HELLO! reported.