Celeb TweetUp: Do It For The Children!

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Today in the wild and varied world of the celebrity Twittersphere, some of our favorite famous people had babies on the brain. In fact, a few even welcomed new babies into their lives. Like Neil Patrick Harris and Alicia Keys. The rest were just thinking about them.

How I Met Your Mother star Neil Patrick Harris is a daddy (of twins):

Mary J. Blige welcomed Alicia Keys‘ new baby into the world:

Meanwhile, Katy Perry is simply obsessed with children's food:

John Cusack thinks his Halloween costume might scare the children:

And Paris Hilton is spending her Halloween helping out at a homeless shelter: