Christopher Schwarzenegger looks unrecognizable in new family snapshots.

In a collection of getaway photos shared by sister Katherine Schwarzenegger on Friday, Christopher, 27, showcased his dramatic weight transformation in a summer-ready ensemble of a fitted button-down shirt and pink shorts as he checked his smartphone.

Other photos showed family members — including mom Maria Shriver and Katherine’s husband, Chris Pratt — enjoying time on a boat in Cape Cod.

“A perfect day ☀️🌊,” the mom of three, 35, captioned the sunny carousel .

Christopher previously showed off his lean new look in June, when he joined dad Arnold and siblings Christina, Patrick and Katherine for the Season 2 premiere of “FUBAR” in Los Angeles.

In May, the University of Michigan grad spoke out about the wei

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