After returning from his Hawaii honeymoon with new wife Katherine Schwarzenegger earlier this week, the 40-year-old actor shared a fully nude photo showing off the bright red sunburn on his back.

But the man figured to be in a world of pain, regardless, after his swim. ALSO ... “This guy was in far more danger of a severe sunburn than he was of being stung by the Spotted Eagle Rays.” ...

We don't have to worry about sunburn but ... it looks like it's not ... must stay in bed and learns to be kinder to his family. Wooden spoon-wielding children competed against each other to ...