Heidi, 46, posed seductively for the shot on Monday, August 18.
The photo was black and white with a rainbow coming through the center.
"All I see is WATER," the former Project Runway host captioned the near naked snap. Heidi's chest was completely exposed in the NSFW pic.
Heidi shared a funnier topless shot on Saturday, August 10, where a gigantic pink floatie covered up her private area.
Heidi and Tom, 29, have been living their best honeymoon life since getting married for a second time in Italy on Saturday, August 3.
They privately wed in February 2019 after announcing their engagement in December 2018.
What are your thoughts on Heidi's NSFW snap? Sound off in the comments!