Heidi Klum wears peekaboo thong before 50th birthday.

Heidi Klum is leaving little to the imagination as she approaches her fiftieth birthday.

On Friday, the former supermodel shared a video of herself dancing in a low-cut gold dress, displaying a black G-string thong with gold accents.

Klum, 49, captioned the video with a party emoji and a red heart and disabled comments on her Instagram post.

Klum showed off her physique in a yellow bikini while relaxing in the sun on Monday.

"Finally some sunshine," she captioned a series of photos that had Klum sniffing a dandelion.

The actress also disabled comments on that post. Klum previously discussed her at-home workout program that helps her stay in shape.

"This type of low-impact exercise is much better for my joints than treadmill running," Klum told Women's Health UK.

"I've relished the opportunity to spend more time at home with my family in recent months," she explained.

"Being able to enjoy getting stuck into domestic tasks because I've been on a plane and in the studio a lot less means I've been able to enjoy getting stuck into domestic tasks."