Megan Fox showed she’s fiancé Machine Gun Kelly’s biggest fan as she snapped photos of him performing at Lollapalooza on Sunday.

The 35-year-old actress stood in the wing of the stage as she recorded her 31-year-old pop star beau.

She even sported a black trucker hat with a letter ‘C’ for ‘Colson,’ the music artist’s birth name.

Supportive: Megan Fox showed she’s fiancé Machine Gun Kelly’s biggest fan as she snapped photos of him performing at Lollapalooza on Sunday

The supportive wife-to-be was dressed like a rockstar herself, clad in a cropped black leather motorcycle jacket.

She skipped a shirt and opted to wear a black triangle bra top underneath instead, showing off her perky chest.

The fashionista paired her top half with a pair of high-waisted medium wash denim jeans that had a single slit over one knee.

Adding an edgy touch to her look she wore a spiky black choker around her long neck.

Excited: The 35-year-old actress stood in the wing of the stage as she recorded her 31-year-old pop star beau

In motion: Machine Gun Kelly performing Sunday at Lollapalooza in Santiago, Chile

The ‘C’ on her hat was bright pink and matched her stiletto manicure.

The beauty queen’s butt-length locks flowed out from underneath her cap in loose waves.

Her makeup gave her glowy skin as she accentuated her gorgeous features with blush, highlighter, and a matte pink lipstick.

Megan had a big smile on her face as she help up a black-encased iPhone to capture her man during his Santiago, Chile Lollapalooza set.

Fun style: Earlier in the day the movie star took to Instagram to show off her edgy tour style as she snapped selfies backstage in Argentina

Earlier in the day the movie star took to Instagram to show off her edgy tour style as she snapped selfies backstage in Argentina.

The raven-haired beauty wore a two-piece pink knit coordinating outfit for the rapper’s last show.

She accessorized with studded pink combat booties and a matching choker with chains.

Photo-ready: The blue-eyed beauty gave fans a closer look at her fun ensemble in a second selfie

The blue-eyed beauty gave fans a closer look at her fun ensemble in a second selfie.

She put her immaculately made up face front and center as she flaunted a clear complexion that was highlighted with a 𝑠e𝑥y cat-eye, blushed cheeks, and pink glossy lips.

The mother-of-three’s long locks were styled in a center part and tight waves that fell over her chest.

Fans also got a better look at her neck jewelry – a bubblegum pink choker with silver studs, chains, and pink dice.

Sweet moment: Megan used a flat iron to straighten MGK’s purple hair backstage at one of his shows

Megan and MGK got engaged on January 11, two years after meeting each other on the set of Randall Emmett’s Midnight in the Switchgrass.

The couple reportedly sealed the arrangement by drinking each other’s blood.

Megan finalized her divorce with the father of her children last year, after 10 years of marriage.

The two share three children – Noah Shannon, nine, Bodhi Ransom, eight, and Journey River, five.

Meanwhile MGK shares 12-year-old daughter Casie Colson Baker with his ex-girlfriend Emma Cannon.

Happy couple: Megan and MGK got engaged on January 11, two years after meeting each other on the set of Randall Emmett’s Midnight in the Switchgrass; seen in NYC in 2021