Seeing double.

Arnold Schwarzenegger’s son, Christopher, bore a striking resemblance to his half-brother, Joseph Baena, in a series of post-weight-loss photos from the family’s Thanksgiving holiday.

Christopher, 28, appeared thinner and more muscular than ever in two pics that his older sister, Katherine, 35, shared to Instagram on Monday.

“So much to be thankful for,” she wrote in the caption alongside the carousel of photos of her famous family.

Besides showing off her brother and his impressive weight-loss journey, Katherine also included pics of her parents, her other siblings and her movie star husband, Chris Pratt.

Arnold, 78, and Maria Shriver, 70, welcomed Katherine, Christina, 34, Patrick, 32, and Christopher before separating after 25 years of marriage in May 2011.

Shrive

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