Tim Stack
February 22, 2010 AT 07:48 PM EST

Sunday night’s season four finale of E!’s Keeping Up with the Kardashians, in which Kourtney gave birth to a baby boy, drew a record 4.8 million viewers for the network, its biggest audience ever. Kardashians has become the most-watched series in the network’s history, averaging 3.7 million viewers this past season.

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