Prince George, Kate Middleton, Prince William

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Life will never be the same for Prince William and Kate Middleton!

The Duke of Cambridge, 32, and the Duchess of Cambridge, 33, welcomed a daughter Saturday, who joins big brother Prince George, 21 months. Whether the couple has discussed the possibility of having a third child is anyone's guess, but for now, they're happy to be a family of four. The Cambridges are in good company, as many of the world's most famous families have four members, too.

E! News has rounded up words of wisdom from fellow parents of two:

Michelle Obama, President Barack Obama

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1. Barack Obama and Michelle Obama: The president of the United States and the first lady are parents to daughters Malia and Sasha. "We've found that we've been able to have dinner almost every night together, between 6:30 and 7," Michelle told Cooking Light. "We have a bigger table and somebody else is doing the cooking, but the conversation and the mood and the tone are still the same. It's our most important time of the day."

Hugh Jackman, Deborra-Lee Furness

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2. Hugh Jackman and Deborra-Lee Furness: After Deborra-Lee underwent fertility treatments and suffered several miscarriages, the Australian actors decided to adopt. Recalling his son Oscar's birth, Hugh said, "You can't prepare for that moment." The star, who also has a daughter, Ava, said on Katie, "You can't even explain how incredible it is and that avalanche of emotion that comes and how it opens up your heart, how it frustrates you, how it angers you, how everything is just...all the sudden how alive you are as a parent."

Jessica Simpson, Eric Johnson

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3. Jessica Simpson and Eric Johnson: After welcoming her daughter Maxwell in 2012, Jessica told People, "There are little things that you kind of obsess over. I never knew how protective I was until I had my own child. I'm already thinking about intruders coming into the house and what our escape route would be." She welcomed son Ace in 2013, giving her plenty of time to plan an exit strategy.

Sir Elton John, David Furnish, Oscars Elton John Party 2014

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4. Elton John and David Furnish: The couple's sons, Zachary and Elijah, were both born via surrogate. "The birth of our second son completes our family in a most precious and perfect way," Elton told Hello! magazine. "It is difficult to fully express how we are feeling at this time; we are just overwhelmed with happiness and excitement."

Jessica Alba, Cash Warren

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5. Jessica Alba and Cash Warren: "Growing up, whenever I was bullied, my mom would say, 'You're a beautiful girl. They're just jealous.' It never helped. I want my girls to know that beauty is being kind," the actress told Natural Health of Honor and Haven. "Beauty is helping people. Beauty is humility."

Naomi Watts, Liev Schreiber, Golden Globes

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6. Naomi Watts and Liev Schreiber: "I feel blessed to be a mother," Naomi told Good Health of raising sons Sasha and Samuel. "For me, it's been a way of fulfilling a long-buried childhood dream. I had always wanted to be a mother but when I was desperately searching for work in L.A. after I moved there from Australia, any thoughts of family were very distant indeed and it seemed that it might never happen for me. Both of us love what we do, but we're also both very, very hands-on parents and it's the most important thing for us to make sure the family stays together, so it will inevitably be a juggling act from now until they're grown up."

Katherine Heigl, Josh Kelley, 2010

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7. Katherine Heigl and Josh Kelley: The two adopted their daughters, Naleigh and Adalaide. "We still talk about having biological children as well—I'm not ruling anything out. But my feeling about adoption is, 'Why not?'" Katherine told Good Housekeeping. "There's nothing about it that makes it any less meaningful of a relationship in my mind."

Drew Barrymore, Will Kopelman

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8. Drew Barrymore and Will Kopelman: Ten months after her firstborn daughter Olive arrived, Drew told InStyle, "I love the person who said, 'Parenting is like wearing your heart on the outside of your body.' It's the most beautiful, perfect analogy." At the time, the actress said she dreamed of having a least one more child, and in 2014, she had daughter Frankie! "I was an only child, and it was lonely. Some people love it and thrive on the independence, but I want my kids to have other kids around," Drew said. "Maybe two kids so they can run around life together, roll their eyes at their parents together like Rusty and Audrey Griswold from Vacation."

Kristen Bell, Dax Shepard, Film Independent Spirit Awards

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9. Kristen Bell and Dax Shepard: "Before we had the girls [Lincoln and Delta], I asked a few people in my life who are annoyingly blunt and honest on every level if we should, knowing that if it wasn't worth it, they'd have the balls to say, 'Listen, don't. Live your life,'" Bell told Good Housekeeping. "But across the board, everyone said it was unmissable."

Joel Madden, Nicole Richie

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10. Nicole Richie and Joel Madden: The fashion designer and Good Charlotte rocker are parents to daughter Harlow and son Sparrow. "I have to always come from a place of love and compassion with them," Nicole said on Oprah: Where Are They Now? "My kids operate best when I let them have a voice. I really explain things to them, because really, kids want to be told the truth. They just do. They just want you to be truthful."

Meanwhile, famous single parents of two include Nick Cannon, Sheryl Crow, Johnny Depp, Kate Hudson, Jennifer Lopez, Ricky Martin, Liam Neeson, Gwyneth Paltrow, Britney Spears and Usher.

Tune in for a brand-new episode of The Royals this Sunday at 10 p.m. on E!

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