Machine Gun Kelly and his fiancée Megan Fox always loved coordinating outfits whenever they attended red carpet events, and their recent get-up didn't fail fans.

The couple turned heads at this year's Billboard Music Awards when they arrived wearing matching black and diamond-studded outfits.

According to People Magazine, the "Transformers" actress dazzled in a black high-slit gown by David Koma. Her look was completed with built-in gloves and a rhinestone accent all over her sleeves.

On the other hand, the rapper-turned-punk rock musician kept it edgy but straightforward by wearing a studded sweater with a coat and slacks that had spikes on the side.

Speaking to E! Red Carpet & Awards Show, Fox said she feels great attending the event as she doesn't have to do anything.

On the other hand, her soon-to-be-husband has to perform because he's nominated for top rock artist.

"I'm honored they're letting us do a fan-favorite instead of a single. So it feels like an honor to show my artistry instead of what's hot on radio. Appreciate that," MGK told the outlet.

It's a special night for the couple as the actress will celebrate her birthday in a few hours.

The special thing about Kelly's look for the evening is his attention-grabbing manicure.

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MGK, whose real name is Colson Baker, collaborated with Marrow Fine founder Jillian Sassone and his manicurist Brittney Boyce of Nails of LA.

His manicure is reportedly worth a whopping $30,000. It features more than 10 carats of real diamonds.

In an interview with the outlet, Sassone said she had fun conceptualizing the nails for several months with Boyce as they worked on several photoshoots in the past, and they share "a lot of synergy from our work ethic to our art."

The manicure was pulled off using the base color "Depressionist" from MGK's own nail polish line called "UN/DN LAQR." The gunmetal transfer foil product was also used on his nails.

The "pièce de résistance," or the 10-carats of tiny diamonds sized between .8 to 2.4mm, was later added.

The overall manicure look took ten hours to complete and was later applied to the singer before he hit the red carpet after his rehearsal.

The diamonds will not be wasted after the event, as they will be upcycled into a collection of rings for charity after the BBMAs.

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