Heidi Klum celebrated turning 51 by posing in her birthday suit. On Saturday, the former Project Runway host headed to Instagram to share some snaps from this year’s festivities, including a video of her posing topless and seemingly without bikini bottoms by the pool. Dressed only in white aviator-style sunglasses and a colorful baseball cap decorated with a smiley face, the model was glowing as she took the candid snap while sunbathing at home.

A topless Klum smiled at the camera and covered her chest with her hand in the short clip, which she posted on her Instagram Story. While the star appeared not to be wearing any swimsuit bottoms in the video, she also shared a photo of her sunbathing alongside her husband Tom Kaulitz while wearing a pair of colorful printed string bikini bottoms.

Colorful pink balloons could be seen in the background of the video, giving a glimpse at her birthday celebration from earlier that day. Klum was busy on Instagram on Saturday, posting several photos from the day in honor of the milestone birthday. In addition to a photo of her as a newborn with her mom Erna Klum, the Victoria’s Secret alum also shared snaps of her kissing her husband and a pic of an intimate family meal in the backyard. Klum, who paired the same white sunglasses from her sunbathing video with a hot pink sweater decorated with blue stars, was surrounded by all four of her kids in the rare family photo.

While her look-alike model daughter Leni has recently been photographed with her mom at the amfAR Gala and in Monaco for the Formula 1 Grand Prix, her other children with ex Seal have stayed mostly out of the spotlight.

Leni, 20, Henry, 18, Johan, 17, and Lou, 14, playfully posed for the camera amongst the decorations of pink roses and balloons. “All I could wish for,” Klum sweetly captioned the shot.

The Sports Illustrated Swimsuit star has previously opened up about how much she enjoys being in the nude while at home, so much so that her kids have to remind her when they have friends coming over.

In an interview on Call Her Daddy with Alex Cooper, Klum said, “I mean, I try to be like that with my kids. Obviously, when you know, no one is there. I’m in my garden also, you know, I’m topless. And they will come, like, ‘You know, my friend is coming over, mom, put your top on.’ And I’m like, ‘When have I ever not had a top on when your friend was coming over? Of course, I will.’”

She added, “But they always make sure. ‘Mom, just a little warning what’s going to happen here.’ And I’m like, ‘Don’t worry.’ I also don’t want to flash anyone just to flash someone. I just don’t love tan lines.”