Here's surf legend Bethany Hamilton gearin' up for her 3rd trimester -- by carving up the swells in Hawaii like a total badass!!
Bethany famously returned to pro surfing after losing her left arm in a shark attack ... so hanging 10 with a 6-month-old fetus seems pretty tame in comparison.
The kid is due in March -- and Bethany's 2-year-old son, Tobias, is pretty stoked to be a big brother ... as you can see in their adorable announcement video.
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