Ivanka Trump‘s heating up the beach once again … showing off her surf skills down in Costa Rica — with supermodel Karlie Kloss by her side!

The First Daughter was spotted in the Central American country Thursday … hitting the beach and hopping back on her trusty surfboard in the crystal clear ocean water.

Check out the pics … Ivanka’s showing off her bod in an orange two-piece — soaked in the salty water but looking happy while walking along the beach later on.

In tow was her husband, Jared Kushner — whose brother Joshua brought his wife, model Karlie Kloss.

It doesn’t appear KK did any surfing like Ivanka … instead hanging by the shore with her man — wearing a black cover-up and a wide-brimmed straw hat.

No Secret Service in these pics, as far as we can tell … though because Ivanka is the current president’s daughter, she is entitled to a few agents.

As we told you … Ivanka’s been channeling her inner Kelly Slater this week — making numerous trips to the water to shred the gnar.

While her skills certainly caught eyes … so did her backside in a tight one-piece while she ripped through the waves.