Alessandra Ambrosio Gets Extra Flexible

Here's Alessandra Ambrosio doing some downward dog ... and upward WOW!!!

The supermodel slipped her slender frame into some yoga pants and a matching pink top, showing off her flexible body ... and the photos will make your jaw drop.

We gotta say ... Alessandra is still smoking hot as she goes through her mid-40s ... friendly reminder that age is just a number.