Heidi Klum poses topless in Hong Kong alongside fiancé Tom Kaulitz

Heidi Klum is feelin' free in Hong Kong!

The supermodel took to Instagram on Wednesday to share a series of pictures taken during a seemingly spur-of-the-moment photo shoot with fiancé Tom Kaulitz.

In a carousel Instagram post captioned 'JETLAG' the 45-year-old star is shown from behind looking out at the Hong Kong skyline in nothing but black underwear. In the subsequent three photos, Klum and Kaulitz are seen staring into one another's eyes while siting next to the glass window. They both appear to be nude in the selfies.

Judging by the photos, Klum and Kaulitz are definitely still in their honeymoon phase. The pair has been together for about a year and a half, and they announced that they were engaged back in December.

Klum shares three children with ex-husband, Seal: Henry, 13, Johan, 12, and Lou, 9. She also shares Leni, 14, with ex-boyfriend Flavio Briatore.

The former Project Runway host isn't the star to strip down on social media this week. Both Kourtney Kardashian and Miley Cyrus posted naked snaps of themselves on Instagram -- with Kardashian's post getting hit with unfortunate Photoshopping allegations.