Brooks Nader is giving fans a show once again … this time rocking a thong bikini — with no top to go with it — during her ongoing vacation in Italy.

Check out the pics from her Wednesday Instagram Story post — the Sports Illustrated Swimsuit Issue cover girl showed off her toned derrière as she balanced on a floating obstacle course off the coast of Sardinia … wearing brown bottoms with nothing to cover her top half.

Brooks looks like she’s having one wet ‘n wild time on the European getaway … which includes her sisters Mary Holland Nader, Grace Ann Nader and Sarah Jane Nader, plus some friends.

She shared another glimpse of their stunning vacation on Instagram Thursday as well — which saw the gal pals getting glitzed and glammed in cowgirl-inspired getups.

The “Dancing with the Stars” alum showed off her figure in a semi-transparent blue corset dress from Italian fashion house Ermanno Scervino and paired it with a bedazzled cowgirl hat.

The picturesque trip comes as Brooks and her sisters promote their upcoming Freeform reality series “Love Thy Nader,” which is due out August 26.