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Olivia Wilde, Kelly Osbourne, and more stars tweet about the royal baby's birth!

By Katie Mathewson Slide 1 of 27

The royal baby is finally here! Click through to see what your favorite celebs have been tweeting about Prince William and Duchess Kate's big day!RELATED:Celebs offer parenting advice for the Royal couple"I don't understand how I'm still doing phone interviews when Kate Middleton is in labor. Don't they have to go cover the crowning?!" --Olivia Wilde
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