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'Roseanne' Stars: Then & Now

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NOW: Johnny Galecki

Following a string of small film and television roles, Galecki, 40, found major success in 2007 as Leonard Hofstadter on the CBS sitcom "The Big Bang Theory." Two of Galecki's former "Roseanne" cast mates, Sara Gilbert and Laurie Metcalf, have appeared on the series. The actor lives on a vineyard in Santa Margarita, California. —XFINITY Entertainment Staff (Photo by Jason Merritt/Getty Images)

The opinions expressed are solely those of the author and do not necessarily reflect the views of Comcast.

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