It's another trip around the sun for Christopher Schwarzenegger . On Saturday, September 27, the producer rang in his 28th birthday, for which his sister Katherine Schwarzenegger shared a round of photos — some highlighting his recent weight loss transformation — along with a heartwarming tribute. Katherine, 35, and Christopher are the eldest and youngest kids of Maria Shriver and Arnold Schwarzenegger, who were married from 1986 to 2011, and who are also parents to Christina , 33, and Patrick , 31, plus the Terminator star shares son Joseph Baena , who will be 28 October 2, with the family's former nanny Mildred Baena .

In honor of Christopher's special day, Katherine took to Instagram and shared a round of photos of him throughout the years, writing: "Happy happy birth

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