Heidi Klum Fined During Honeymoon for Swimming in Forbidden Italian Waters

RTL news in Germany reports that they did in fact enter the water, and after police found out about the swim, the couple was fined around 6,000 euros ... or about $6,700.

It's not the first time Klum and Kaulitz have taken an illegal dip in the Blue Grotto, as they shared a romantic swim back in October. It's unclear if they were hit with a fine that time.

The Blue Grotto is only about 200 ft long and 80 ft wide, and must be entered by lying down on a boat and using a guiding chain, attached to the walls of the cave, to enter.

The grotto is one of several magnificent sea caves around the world that is highlighted by a brilliant blue light.

Officials also say swimming is illegal because, "high waves can slam swimmers against the stone of the low cave mouth."

Klum has not yet commented on the fine, but she's still probably recovering from the whirlwind wedding just days earlier.

The supermodel wed the "Tokio Hotel" guitarist aboard the "Christina O" yacht, however they had already legally married back in February during a low-key ceremony in L.A.