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Chris and Katherine's nuptials were "classic and romantic", with a host of celebrities attending the lavish ceremony at San Ysidro Ranch in Montecito, California on Saturday.
Anna attended with her six-year-old son Jack, who she shares with ex-husband Chris, proving that exes can be friends and move forward.
The former couple announced they'd broken up in August 2017 after eight years together, with the pair finalising their divorce in October the following year - but they have remained on good terms for the sake of their son.
As Chris revealed his engagement to author Katherine five months ago on Instagram, Anna commented: "I'm so happy for you both!! Congratulations!"
E! reports that the couple invited a total of 70 guests to their wedding, and Katherine was walked down the aisle by her dad, Arnold Schwarzenegger, wearing a white, strapless Giorgio Armani gown.
"It was classic and romantic," a source told the publication. "Everything was beautiful and elegant. Guests were seated on long wooden pews which lined the rows."
The insider added: "The train was so big she was laughing about it because she needed help as she walked.
"She looked so excited to see Chris and had a huge smile on her face. Chris was in a dark suit, along with his son Jack who stayed close by his side."
The newlyweds married in a whirlwind romance after Chris got down on one knee after seven months together in January this year.
Congratulations again, Chris and Katherine!
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