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American Idol history was made last night when Haley Reinhart (at left in Domino jeans, a Meghan top, House of Harlow boots and Sisco & Berluti bangles) became the first contestant ever to sing an unreleased song—Lady Gaga’s “You and I.” Lauren Alaina (at right in a Sheri Bodell chain dress, David Lerner leggings, and a Bebe belt) channeled her inner Carrie Underwood during a rendition of “Flat on the Floor,” before the cast changed gears to perform hits from the ’60s and ’70s. “Every week I am pushing their style more and more, but the era had nothing to do with it. I want them to be themselves week after week,” the show’s costume designer Soyon An told InStyle. “It’s all about choosing looks that fit and enhance their individual style.” Click through the gallery for more designer details from last night’s episode!

Eva Mendes and Naomi Watts have new gigs to add to their resumes: Pantene’s celebrity ambassadors! Mendes will be the face of the Pantene Breakage to Strength collection, which helps to repair split ends, white Watts will be the spokesperson for the Flat to Volume line, formulated to give extra body to fine hair. “I want to let women with fine hair know that achieving beautiful, voluminous hair is possible without damaging your hair or adding extensions,” Watts said of her campaign. Starting in July, the actresses will appear in TV and print ads for the brand, but you can get a sneak peek now! “There were no tricks on the set of the photo shoot,” Mendes said. “Each look was natural and never manipulated, and my hair looked healthy and beautiful for each shot.” Click through our gallery to get a behind-the-scenes look at their photo shoot.

Celebrities traveled far and wide to have a good time last night! Joshua Jackson and Diane Kruger enjoyed some post-Met Gala R&R (and a little PDA) at the opening of the Edition Hotel in Istanbul, Turkey, Demi Moore gave TV execs a sneak peek at her new TV show during the A&E Television Networks upfront presentation in New York City, and Emma Roberts hosted the stars of Glee at Nylon‘s Young Hollywood bash in L.A. Click here to see all the photos from the hottest parties around the globe!