Christina Applegate Is Pregnant

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July 21, 2010 | 2:21pm EST

The Samantha Who? star is expecting her first child with fiance Martyn Lenoble, her spokesperson has confirmed to

Applegate credits rocker Lenoble with helping her recover after her battle with breast cancer and subsequent double mastectomy.

She says of the Dutch bass player, “I’m very grateful to Martyn for coming along at a time that he did because he’s been my rock through all of this. He gave me something to really want to live for and something to smile about.”