The former 'Osbournes' reality star remained in Hawaii after marrying actress-and-model Lisa Stelly in an intimate ceremony on Sunday.
The romantic post-nuptial break took a dramatic turn when Jack and his friend Tyler rescued a woman who was struggling in the surf.
Lisa tweeted: "Really proud of Jack and his friend Tyler who saved a woman on the beach yesterday who'd had a heart attack and drown. They resuscitated her until the ambulance came. We just found out she's in a stable condition! Awesome! (sic)"
The wedding and rescue come just months after Jack revealed he was diagnosed with degenerative motor neurone disease, Multiple Sclerosis, soon after the birth of his daughter Pearl.
He said recently: "Honestly, I'm fine. Ultimately that is the toughest thing with this disease that I'm learning, one minute you can be fine, and the next I went blind in my right eye. It's a completely unpredictable disease."Related Video: Jack Osbourne introduces daughter Pearl