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REPORT: Pippa Middleton "Regularly" Visiting Pregnant Sister Kate Middleton Amid Morning Sickness Battle

That's what sisters are for! Pippa Middleton is reportedly visiting her pregnant sister, Kate Middleton, on a regular basis amid the Duchess of Cambridge's battle with severe morning sickness, a source told Us Weekly. Her pregnancy was announced on Monday, Sept. 4 by Kensington Palace.

It only makes sense that Pippa — who is rumored to be pregnant with her first baby but has yet to make the official announcement — has been there for Kate, 35, during this special yet hard time (her hyperemesis gravidarum has caused her to have to cancel many of her royal engagements). The sisters served as each other's Maids of Honors during their weddings and are always seen photographed together. Plus, Pippa is already an amazing aunt to her nephew, Prince George, and niece, Princess Charlotte, so we have no doubts that she'll be there for royal baby No. 3 as well.

The 34-year-old isn't the only one who's been there for Kate since her baby news broke. It was previously reported that Kate's mom, Carole Middleton, rushed to her daughter's side to help take care of her. After the news broke on Monday, Carole was seen leaving Kensington Palace in her white Range Rover.

Kate was also hospitalized last month, leaving many royal fans to believe it had something to do with her hyperemesis gravidarum. Symptoms of the illness include dehydration, vitamin and mineral deficit, and weight loss through frequent nausea and vomiting. We hope Kate is starting to feel better with her family by her side!

Click through the gallery below to see cute photos of Kate and Pippa together!