Must-see star sightings of the week: PHOTOS

Jennifer Lopez walked the red carpet at the premiere of "Atlas" in a white top and black mermaid skirt designed by Greta Constantine. (Photo by Kevin Winter/Getty Images)

Heidi Klum attended the Cannes amfAR Gala red carpet in a pink Lever Couture gown with ruffles, a slit and a long train. (Photo by Daniele Venturelli/Getty Images for Red Sea International Film Festival )

Demi Moore arrived to the premiere of "The Substance" at the Cannes Film Festival in a corseted champagne-colored Schiaparelli Haute Couture gown with a dramatic wing flaring out from the left bust. (Photo by Gisela Schober/Getty Images)

Kevin Costner looked dapper on the red carpet at the premiere of his self-funded movie, "Horizon: An American Saga," in a classic black tuxedo. (Photo by Gisela Schober/Getty Images)

Jewel walked the red carpet at the LGBT Center Gala in a sequined gold dress with feathers, a plunging neckline and a fringe skirt. (Photo by MICHAEL TRAN/AFP via Getty Images)

Katherine Schwarzenegger and Chris Pratt at "The Garfield Movie" premiere in custom Paul Smith outfits. (Photo by River Callaway/Variety via Getty Images)

Elle King at the GRAMMY Hall Of Fame Gala in a long-sleeved blue minidress with fringe on the sleeves. (Photo by Sarah Morris/Getty Images for The Recording Academy)

Bella Hadid on the Cannes Film Festival red carpet in a sheer brown Saint Laurent minidress. (Photo by Gisela Schober/Getty Images)

Eva Longoria walked the red carpet at the Cannes Film Festival in a light blue dress with bedazzled straps and daring cutouts. (Photo by Samir Hussein/WireImage)

Chris Hemsworth walked the carpet at a press event for "Furiosa: A Mad Max Saga" in a light gray suit and black dress shirt. (Photo by Jeff Spicer/Getty Images for Warner Bros. Pictures)

Demi Moore posed for photos at Chopard’s "Once Upon a Time" event in a floor-length yellow Oscar de la Renta gown with floral details. ( )

Jennifer Lopez at the "Atlas" premiere in Mexico City in a white ruffled Chloé dress with a plunging neckline and high slit. (Photo by Adrián Monroy/Medios y Media/Getty Images)

Cher walked the red carpet at the amfAR Gala alongside Alexander Edwards in a black dress with sheer paneling and a black coat, while he wore a black suit. (Photo by Michael Buckner/Variety via Getty Images)

Salma Hayek walked the red carpet at the premiere of "Emilia Perez" at the Cannes Film Festival in a black figure-hugging strapless Saint Laurent gown. (Photo by Gisela Schober/Getty Images)

Anya Taylor-Joy wore a cheeky red dress held together with twelve black belts in the back, leaving a portion of her backside exposed for her appearance on "The Late Show with Stephen Colbert." (Photo by Gotham/GC Images)

Priyanka Chopra stepped out of her hotel in Rome in a sequined black dress with a plunging neckline. (Photo by Franco Origlia/GC Images)

Cate Blanchett channeled one of her Oscars when she walked the red carpet at the Cannes Film Festival in a gold Louis Vuitton dress. (Photo by Beata Zawrzel/NurPhoto via Getty Images)

Julianne Moore walked the red carpet at the "Horizon: An American Saga" premiere in a green off the shoulder Bottega Veneta dress. (Photo by Pascal Le Segretain/Getty Images)

Kelly Rowland attended the premiere of "The Count of Monte Cristo" in a strapless white dress. (Photo by CHRISTOPHE SIMON/AFP via Getty Images)

Selena Gomez walked the carpet at the premiere of "Emilia Perez" in a black Saint Laurent dress with white bardot sleeves. (Photo by Kristy Sparow/Getty Images)

Bella Hadid attended the premiere of "L’Amour Ouf" in Cannes, France, in a black Versace gown, wearing her hair in big curls. (Photo by Mustafa Yalcin/Anadolu via Getty Images)

Leni Klum walked the carpet at the amfAR Gala in a sheer knit dress with 3D floral embellishments on the bust and hips. (Photo by Gisela Schober/Getty Images)

Cate Blanchett walked the carpet at the Cannes Film Festival in a black and pink Jean Paul Gaultier gown with a pearl band across her back. (Photo by Gisela Schober/Getty Images)

Demi Moore stunned on the amfAR Gala red carpet in a white satin dress with crystal embroidery, a plunging neckline and long train. (Photo by Gisela Schober/Getty Images)

Uma Thurman wore a white Erdem Spring skirt with black floral designs and matching skirt to a press event for her new film, "Oh, Canada." (Photo by Andreas Rentz/Getty Images)

Sienna Miller looked ethereal in a semi-sheer chiffon purple ruffled Chloe gown on the red carpet at the premiere of "Horizon: An American Saga." (Photo by Pascal Le Segretain/Getty Images)

Paris Jackson attended the amfAR Gala in a textured black mullet dress, showing off her legs. (Photo by Gisela Schober/Getty Images)