With a fast-approaching due date, Kate Middleton is a vision! Life & Style exclusively learned that the 36-year-old royal is expecting identical twin girls! Prince William, 35, and Kate “couldn’t be happier about their double-baby news,” a source revealed. “She’s been telling pals that she’s thrilled to be pregnant with two little princesses and has been proudly showing the sonogram to those closest to her.”

And, the excitement doesn’t end there! William and Kate also want to honor the late Princess Diana once the twins arrive. In fact, Kate suggested they name one twin Diana, which William agreed was the ultimate tribute to his late mother, a royals insider said. “They don’t plan to coordinate the girls’ names to rhyme or start with the same letter” the way some parents do. Though they’re still debating the final choices, they’ve narrowed down names for the second baby, the source said: “They both like Victoria, Alice, Olivia, Alexandra, and Elizabeth.”

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(Photo Credit: Getty Images)

During her most recent sonogram, Kate was able to see the babies’ movements. “One of the babies was calm and relaxed, whereas the other had endless energy,” the source added. “In a way, Kate feels like she got an idea of what the girls’ personalities are like! Kate jokes that the active baby is a ‘drama queen in the making.’”

If so, she’ll have plenty of competition at home. Queen Elizabeth II (known to her great-grandchildren as “Gan-Gan”), 91, has dished that the twins’ boisterous older sis, Princess Charlotte, 2, wears the bossy pants in her relationship with her brother, Prince George, 4. “Kate says the chill baby is taking after George, and her sister is like Charlotte, personality-wise,” the source continued. “But both babies have been keeping Kate awake at night, as they’re constantly hiccupping and moving around!”

William and Kate have plenty of loved ones stepping up to the plate to make sure the transition goes smoothly. Aside from her hands-on mother, Carole Middleton, 63, and their trusted nanny, Maria Borrallo, Prince Harry’s fiancée, Meghan Markle, already has been pitching in. “Meghan has been by Kate’s side during the pregnancy and is always helping out,” the source revealed. “Meghan often cooks healthy meals for Kate to ensure she’s getting all the right nutrients. She adores George and Charlotte and looks after them if Kate wants to take a nap.”

The queen is overjoyed to be welcoming two new great-grandchildren, the palace insider explained. But the most important member of Kate’s support team is, as always, her husband. Though a pal said that Wiliam jokes about taking on more royal responsibilities “just to stay out of the house and get some peace,” in reality, he is the pregnant Duchess’ constant rock. “William can’t wait for the twins to be born. He’s a fantastic husband and extremely supportive of Kate.”

For more on Kate Middleton’s pregnancy, pick up the latest issue of Life & Style, on newsstands now!