Anitta sizzles in racy black minidress as she joins Madonna on stage at ... trends now

Anitta stole the spotlight at Madonna's historic free concert in Rio de Janeiro on Saturday night. 

The 31-year-old Envolver hitmaker — who was born in Brazil — sizzled in a racy outfit as she joined the Material Girl on stage for the Vogue sequence during the final Celebration Tour stop at Copacabana Beach.

Dressed in a fitted, black corset-style minidress with sheer, elbow-length gloves, the singer looked every inch the sizzling pop star for her guest appearance. 

She accessorized with a necklace sporting a large, cross-shaped pendant, an apparent nod to the 65-year-old icon. To complete the sizzling look, she wore sheer stockings and high heels.

Anitta also took to her Instagram to share gorgeous snaps of her outfit and a short clip of herself inside what appeared to be a hotel room as she excitedly sang one of Madonna's songs, La Isla Bonita. 

She captioned the snap, 'Ready for the queen,' followed by a crown emoji and the hashtag, '#MadonnaCelebrationTour.' 

Anitta's guest appearance comes after Cardi B joined forces with Madonna on stage in Los Angeles, while Pamela Anderson made a surprise appearance at one of the singer's shows in Canada. 

During London's concert, fashion designer McCartney was seated alongside Madonna, as Bob the Drag Queen added color commentary to the runway strut.

In the past, artists such as FKA twigs, DJ Diplo, Donatella Versace and Jean Paul Gaultier joined in on the Vogue part of the tour.

Versace and Gaultier even had a hand in designing some of the incredible costumes Madonna rocks on stage for the Celebration tour.

Meanwhile, the Express Yourself superstar — who recently put on a sultry display during rehearsals ahead of the anticipated performance — labeled the historic, final tour stop as 'her biggest show yet,' according to the official website.

The show was notably 'free of charge as a thank you to her fans for celebrating more than four decades of her music over the course of the epic global run of the tour.'

One of the outfits during the big night comprised of a long-sleeved, flowy black gown that was fitted around the bodice area.

Shiny fabric with embellishments draped down from the sleeves and connected in front for a dramatic flare.

Madonna's makeup was glammed up, and comprised of a layer of mascara to her lashes as well as smoky, shimmering shadow around her eyes.

Her locks were parted in the middle, and effortlessly flowed down past her shoulders in light waves.

A large, silver head piece was placed on top of her head, and was adorned with crystals that sparkled underneath the bright stage lights. 

For a finishing touch to the overall look, she opted for a pair of fingerless, black lace gloves. 

A pink blush and warm contour was added to better accentuate her cheekbones, while a satin, dark rosy tint was worn on her lips.  

Later during the anticipated concert, the Frozen hitmaker opted for a fitted, semi-sheer corset top that was made of a black, lace material. 

She additionally donned a colorful, plaid miniskirt as well as a pair of black, fishnet tights and heeled ankle boots.   

The Queen of Pop - whose full name is Madonna Louise Ciccone - layered the look with a black-patterned jacket that was left unfastened at the front to better show off the outfit. 

During a portion of the set, Madonna was joined by her backup dancers who also donned stylish ensembles. 

The singer had an additional outfit change while wearing a red satin minidress that had black, lace material on the neckline and hem. 

She slipped into a pair of over-the-knee, black boots that were secured with lace details on the front. 

The star sported a different hairstyle that comprised of blonde locks that were parted to the side, and fell down in voluminous curls. 

Madonna was once again joined by her backup dancers as she performed some of her hit tracks for the large crowd. 

Madonna also opted for an eye-catching, neon green minidress which she paired with opera-length, blue gloves with rhinestone details.