Whenever any family grows, it's an exciting moment for its current members. But these girls are beyond elated when they find out they're going to have a new sibling.
When their mom announces she's pregnant by surprising them with two custom cookie cakes that read "Big Sister" and "Big Sister...Again," the two erupt in adorable delight.
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Watching them look at the sonogram picture -- and embrace one another in happiness -- is so heartwarming.
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1. Sophia
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Pictured: Sophia Grace
2. Emma
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Pictured: Emma Watson
3. Olivia
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Pictured: Olivia Munn
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4. Isabella
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Pictured: Kristen Stewart as Bella Swan from "Twilight."
5. Ava
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Pictured: Actress Ava Gardner (1922-1990)
6. Mia
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Pictured: Actress Mia Wasikowska
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7. Emily
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Pictured: Emily Blunt
8. Abigail
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Pictured: Abigail Breslin
9. Madison
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Pictured: Madison Avenue and 42nd St. in New York City.
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10. Elizabeth
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Pictures: Actress Elizabeth Taylor (1932-2011)
1. Noah
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Pictured: Russell Crowe who plays Noah in 'NOAH'
2. Liam
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Pictured: Miley Cyrus, right, and Liam Hemsworth
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3. Jacob
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Pictured: Taylor Lautner as Jacob Black from "Twilight"
4. Mason
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Pictured: Kourtney Kardashian and Mason Dash Disick
5. William
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Pictured: Prince William
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6. Ethan
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Pictured: Ethan Hawke
7. Michael
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Pictured: Michael Jordan
8. Alexander
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Pictured: Equestrian Statue of Alexander the Great at Thessaloniki, Greece
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9. Jayden
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Pictured: Jayden Smith, left, and Willow Smith
10. Daniel
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Pictured: Actor Daniel Radcliffe