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Friends may have ended over a decade ago, but Monica Geller will live on forever. So we’re ringing in Courteney Cox’s 51st birthday with 30 of our favorite Monica moments and -isms. From her unique brand of micro-management to the humidity-induced Barbados 'do she so boldly embraced, we’ve got the best Monica highlights of all 10 seasons present and accounted for — just don’t blame us when you start adopting “I know!” all over again.