Christopher Schwarzenegger can carry all the pumpkins in the patch.

The 28-year-old son of Arnold Schwarzenegger and Maria Shriver —who revealed earlier this year that he's lost 30 pounds—showed off his sculpted arm muscles in a white tank top while on a trip to a pumpkin patch in Brentwood, Calif. on Oct. 27. Fittingly for his new bulked-up look, he also appeared to be drinking what appears to be a protein shake.

Christpher was in uncle mode for the day, carrying up to three pumpkins at a time as he was spotted at the festive fall outing with his sister Katherine and her husband Chris Pratt , as well as their daughters Lyla , 5, and Eloise , 3. (The couple also shares Ford , 11 months, although he was not pictured.)

The outing had the associate producer putting his

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