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Stop everything: The Royal Baby has officially arrived. 

Prince William's wife Kate Middleton, Duchess of Cambridge, gave birth to a baby boy in a private wing of St. Mary's Hospital on Monday afternoon. The baby arrived at 4:24 PM local time and weighed 8 pounds, 6 ounces. Clearly the Future King of England's safe and healthy arrival is cause for celebration, especially among Brits.

Ellie Goulding, Little Mix and Cheryl Cole all congratulated the Royal couple via Twitter, while Americans like Pitbull, Josh Groban and Blink-182's Mark Hoppus also sounded off. See the best tweets from musicians below: