They’ve never been shy about showing off their love.

But Megan Fox and Machine Gun Kelly pushed the limits of PDA at the 2021 Billboard Music Awards on Sunday.

The Transformers actress, 35, and Bloody Valentine singer, 31, caused quite the stir as they groped each other and passionately made out right on the red carpet.

Not shy! Megan Fox and boyfriend Machine Gun Kelly pushed the limits of PDA while on the red carpet of the 2021 Billboard Music Awards on Sunday

Fox had her hands all over MGK, even seen grabbing him below the belt while they posed for the cameras. Both celebs were showing tons of skin.

Megan rocked a dangerously revealing black Mugler dress with bold cut-outs that highlighted her full cleavage and flat abs.

Below the barely-there top, a sheer skirt hugged her hips and legs to offer another layer of 𝑠e𝑥 appeal.

Meanwhile, singer/actor Kelly flaunted his tattooed torso by going shirtless under a classic black tuxedo jacket.

Handsy! The Transformers actress got very hands-on with the Bloody Valentine singer

Scandalous! Fox grabbed MGK below the belt while they posed for the cameras.

Stunner: Megan rocked a dangerously revealing black Mugler dress with bold cut-outs that highlighted her full cleavage and flat abs

Sheer wonder: Below the barely-there top, a sheer skirt hugged her hips and legs to offer another layer of 𝑠e𝑥 appeal

Giving his look even more edge, MGK – whose birth name is Richard Colson Baker – had his tongue painted black.

The singer gave fans a behind-the-scenes look at his grooming routine ahead of the ceremony, where he won Best Rock Album.

He would go in to win Top Rock Artist as well, sharing a sizzling smooch with Megan before taking the stage to accept his trophy.

Earlier in the day MGK had his tongue painted after a haircut, calling it his ‘special accessory’ on his Instagram Story.

No shirt, no problem: Singer/actor Kelly flaunted his tattooed torso by going shirtless under a classic black tuxedo jacket

Double trouble: The couple took a sizzling pre-show snapshot together

Taste buds: Giving his look even more edge, MGK – whose birth name is Richard Colson Baker – had his tongue painted black

Meanwhile Megan prepped for the event by working with makeup artist Monika Blunder, who revealed that she wanted to create a look that perfectly complemented the actress’s ‘𝑠e𝑥y’ ensemble.

‘Megan’s red carpet dress is very 𝑠e𝑥y, showing off her beautiful figure,’ Monika explained.

‘To complement the sultry ensemble, we wanted to create a more classic beauty look. Focusing on her beautiful skin, we created a flawless, glowing complexion and accentuated her eyes with a strong, cat-eyeliner and bold brows.’

Monika used skincare and makeup from Charlotte Tilbury to achieve the look, which began by prepping the complexion with the brand’s Instant Magic Facial Dry Sheet Mask, Charlotte’s Magic Cream, and Charlotte’s Magic Lip Oil Crystal Elixir.

To accentuate Megan’s naturally-glowing skin, Monika applied the Charlotte Tilbury Hollywood Flawless Filter, before adding a pop of color with the Cheek to Chic blush.

The bold brow came courtesy of the Brow Cheat and Brow Fix, while Monika painted on a cat eye with the Feline Flick Eyeliner.

Megan and Kelly went public with their new relationship in May 2020 after meeting on the set of Randall Emmett’s directorial debut, Midnight In The Switchgrass.

The Jennifer’s Body beauty ‘is definitely in love’ with her beau, but is ‘having a great time with where things are at now,’ the source said.

She filed for divorce from her husband of 10-years, Brian Austin Green, on the day before Thanksgiving, and the couple are currently trying to figure out a custody arrangement for their three children.

Sealed with a kiss: The pair shared a passionate kiss before he accepted his Top Rock Artist award

Thrilled! The blonde bombshell was thrilled by his win

Winner! MGK looked triumphant as he held his award high

Twice as nice! He showed off his tinted tongue and two trophies at the same time

Biggest fan! Fox snapped a photo of her love with his two honors

‘She really takes her kids into consideration and knows that taking that next step would be a big adjustment, but it’s not off the table,’ the insider added.

‘There is definitely still some tension between Brian and Megan as they had a difficult separation, but they manage to make it work for the sake of the kids.’

Kelly has a 12-year-old daughter from a previous relationship named Casie.

Congratulations! The singer learned he won Best Rock Album before even arriving at the ceremony

Snip, snip: The platinum blonde rocker had his messy-chic tresses clipped

Unique! After getting a haircut MGK painted his tongue, calling it his ‘special accessory’ on his Instagram Story

They made their red carpet debut at the American Music Awards where she revealed a new tattoo likely dedicated to her musician beau with the Spanish words ‘el pistolero’ scrawled across her collarbone, which roughly translates to ‘the gunman.’

During an interview on Lala Kent’s podcast, Megan said she ‘knew right away that he was what I call a twin flame.’

She added: ‘Instead of a soul mate, a twin flame is actually where a soul has ascended into a high enough level that it can be split into two different bodies at the same time. So we’re actually two halves of the same soul, I think.’