Heidi Klum, 51, soaks up the sun in nothing but black thong bikini bottoms

Heidi Klum put her beach bum on display again.

The supermodel showed off her backside in a 3-second Instagram clip Wednesday as she laid down on her stomach in nothing but a pair of black thong bikini bottoms.

The model appeared to be avoiding tan lines on her upper half as she chose to go topless during her sunbathing session.

“Preparation ☀️,” she captioned the video, making sure to also turn off comments under the post.

In the video, she appeared to lay her hair to the side before dropping her head on the end of the pool chair, showing off the pool’s clear water behind her.

Klum, who is no stranger to showing off her skin with some of her racy clothing choices, was last pictured in a swimsuit in January when she vacationed on the beach with her husband, Tom Kaulitz.

The pair, who tied the knot in 2019, were spotted packing on the PDA while in St. Barts.

The “Project Runway” star flaunted her fit figure in a brown bikini, which she paired with a full cheetah-print coverup and matching towel.

They even took a dip in the water as Kaulitz, who wore red-striped swim trunks, held Klum in his arms.

Just a month prior, Klum, 51, switched up the temperature — but not her skin-baring style — as she and Kaulitz vacationed in Aspen, Colo., with her kids.

The “America’s Got Talent” judge shared a video of herself rocking a red lace thong and panty set as she braved the snowy weather to play outside.

Klum is mom to four children: Leni, 20, whom she shares with ex Flavio Briatore; and Henry, 19, Johan, 18, and Lou, 15, whom she welcomed with her second ex-husband, Seal.

Leni and Henry have both followed in their famous mom’s footsteps and have since started up their own modeling careers.