Heidi Klum, 51, is a busty bombshell in low-cut gray dress as she arrives at the America's Got Talent quarterfinals

Heidi Klum looked every bit the blonde bombshell as she arrived at the America's Got Talent live taping in Pasadena, California on Tuesday night.

The German supermodel, 51 — who was seen hours earlier in a lace bra — wowed in a low-cut gray dress that showed off her ample cleavage.

The skintight frock stopped just before her ankles, allowing her to showcase her black high-heels.

Heidi's sandy blonde hair cascaded down her chest in glamorous loose curls.

As for makeup, the mother-of-four rocked sultry brown eyeshadow and her go-to glossy nude lip.

Her cheeks were dusted with a luminous peach blush and her complexion had a noticeably sun-kissed glow.

Heidi was decked out in sparkly jewelry, including a long gold necklace and a chunky diamond bracelet.

Exuding confidence, Heidi flashed a smile at photographers as she made her way down the red carpet ahead of the taping.  

She stopped to take photos with 10-year-old singing sensation Pranysqa Mishra, who is among the season's quarterfinalists.

America's Got Talent premiered its 19th season on NBC in May 2024. 

Heidi co-judges the competition with comedian Howie Mandel, Modern Family star Sofia Vergara and creator Simon Cowell.

Actor/comedian Terry Crews has been the show's host since 2019. 

Tuesday night's episode marked the final round of quarterfinals, which first kicked off on August 14 after eight rounds of auditions.

For the first time in AGT history, the judges were given a live show golden buzzer. If pressed, the live golden buzzer sends one lucky act straight to the show's finals.

And the judges looked thrilled to be wrapping up this stage of the competition as they posed up on the red carpet before showtime.

Howie looked chic in a fitted blazer, skinny slacks and bright white loafers.

The stand-up comic, 68, completed his outfit with a pair of designer sunglasses.

Simon, 64, made it a family affair by walking the red carpet with son Eric Cowell, 10, and fiancee Lauren Silverman, 47.

Sofia didn't walk the red carpet but she did appear later on the judge's panel in a sexy orange strapless dress. 

Host Terry put his bulging muscles on display in a fitted green suit with a matching tie and crisp white button-up shirt.

E! News correspondent Catt Sadler was also on hand for the celebratory night in LA.

The reporter, 50, looked effortlessly stylish in brown satin pants and a low-cut blouse as she mingled with Simon's fiancee.

Before stepping in front of cameras in her busty dress, Heidi showed her herself getting ready on her Instagram Story.

She captured her hairstylist putting the finished touches on her curly blonde mane as she sat patiently in a chair.

Pieces of her hair were clipped in place with hot pink clips to ensure a flattering curl pattern around her face.

Heidi included a close-up selfie, giving her 12.2million followers a better look at her flawless makeup.