Christopher Schwarzenegger ditched his shirt to show off his dramatic new fitness transformation while on vacation.

In a snapshot shared by sister Katherine Schwarzenegger on Sunday, the 27-year-old stood on a boat smiling while displaying his sculpted muscles.

He wore a pair of blue striped swim trucks and sported a subtle goatee while mischievously pointing at the water.

Another pic showed the son of journalist Maria Shriver and former California governor Arnold Schwarzenegger with a friend in a bikini top and skirt as they enjoyed the sunny boat ride.

Katherine, 35, also shared a sweet PDA pic with husband Chris Pratt, 46 — the pair sat side by side on the boat, with the “Guardians of The Galaxy” actor closing his eyes in bliss. Two additional snapshots showed Shriver, 69, subme

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