Little Shiloh Jolie-Pitt is growing up to be such a big girl! As Brad Pitt and Angelina Jolie‘s towheaded tot gets ready to turn 2 on May 27, a heavily pregnant Angelina is doing her best to help her daughter understand the basics of being a big sister!

To prep her, Angelina,32, has been having the 23-month-old spend quality time with her older sister, Zahara, 3. Mother and daughters bonded poolside over Mother’s Day weekend at the villa of Microsoft co-founder Paul Allen in St.-Jean-Cap-Ferrat, France, and on May 12, mom and daughters ventured into Monaco to buy some fashionable kiddie clothing. (Meanwhile, dad Brad, 44, enjoyed a boys’ day out with sons Maddox, 6, and Pax, 4.)

"It’s increasingly important to Brad and Angelina, as they near the birth of their twins, that Shiloh be okay with being a big sister," a source close to the Jolie-Pitt clan tells OK!. "They are always wanting to do special things for her so she feels included and bonds with the other kids. She looks up to Zahara, so everyone is hoping Z will teach her the ropes when it comes to being a good older sister."

For the full scoop on Branglina and their brood, pick up the new issue of OK!.

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