AceShowbiz - Heidi Klum's husband Tom Kaulitz has shown his obsession with her belly. During their PDA-packed vacation in Venice, Italy, the Tokio Hotel guitarist could not keep his hand off the "America's Got Talent" judge's body, especially the middle part.

In photos making their way online, the 33-year-old musician was captured placing his left hand on his 50-year-old wife's stomach as they stood closely in front of each other during their Friday, June 23 day out. While doing so, the smitten couple was seemingly having a conversation and adoringly gazing at one another.

The two were spotted sharing a passionate kiss when his palm was still on her belly. In other photos, the married couple was seen holding each other's hands while walking side by side. Meanwhile, she was also caught on camera caressing her tummy with her left hand in other photographs.

For their romantic outing, Tom and Heidi did not only enjoy each other's company. The twosome was joined by Heidi's 16-year-old son Johan and 13-year-old daughter Lou, whom she welcomed together with her second ex-husband, Seal. At one point, Heidi was spotted holding hands with Lou as the mother and daughter duo walked.

That same day, Heidi shared a video from the day out on Instagram. In the clip, she could be seen filming herself as she sat on a boat. She was smiling widely while soaking up the sun. She played a song by Kali Uchis titled "Telepatia" as the background music of the post. Along with the short footage, she wrote a simple caption that read, "ITALY IT," and added a smiling face with hearts emoji.

The former Victoria's Secret model followed up the post by sharing a series of photos and videos in another post. The snaps and clips showed her hugging a huge tree, enjoying an art gallery and a boat ride with her two kids and husband. Accompanying the post, she wrote, "IT," adding a slew of five different emojis.

For the occasion, Tom sported a short-sleeved embossed light orange V-neck shirt, a pair of long ivory baggy pants, brown sneakers and black sunglasses. Meanwhile, his wife donned a black bra top and paired it with a long lacy black skirt. She added a big brown leather bag, a pair of brown slippers and nude-framed shades. She also carried a black lacy umbrella.

Tom and Heidi are never shy to show their affection to each other. On Monday, May 29, the two were spotted getting handsy with each other during a yacht outing off the coast of Cannes in France. At that time, they were also spotted locking lips in different areas of the luxury boat.