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Jon Bon Jovi knows how to spend his rock star money!

The 50-year-old rocker flexed his pecs while on vacation with his wife in St. Barth. Bon Jovi and his wife Dorothea are celebrating their 23rd wedding anniversary. In this biz, that's an eternity!

Jon and his wifey, who are vacationing with three of their four kids, seem to know how to keep the flame alive.

Check out more photos of the Bon Jovi family in our gallery below.