A couple covered in mud wait for it to dry at the Salt-works lakes near the Black Sea town of Burgas in Bulgaria on July 25, 2019. Thousands of tourists visit the red salt lakes for mud baths, which are believed to help the healing of muscular disorders and rheumatism. (Photo by Nikolay Doychinov/AFP Photo)

This picture taken on January 6, 2018 shows macaque monkeys looking at a man's camera during snowfall at Wulongkou Nature Reserve in Jiyuan in China's central Henan province. (Photo by AFP Photo/China Stringer Network)

Singer Rihanna in the audience at the 54th Annual GRAMMY Awards held at Staples Center on February 12, 2012 in Los Angeles, California. (Photo by Larry Busacca/Getty Images For The Recording Academy)

Rita Ora attends the the GQ Men Of The Year Awards 2019 in association with HUGO BOSS at the Tate Modern on September 3, 2019 in London, England. (Photo by David M. Benett/Dave Benett/Getty Images for HUGO BOSS)

Kendall Jenner dazzles as the face of La Perla's feminist lingerie collection in Los Angeles, California on November 10, 2016. The 21-year-old model stars in a new campaign for the brand centered on “the liberation of every woman from the need to suffer for beauty”, reports Entertainment Tonight. La Perla released photos of Jenner and fellow models Isabeli Fontana and Liu Wen in its Spring 2017 collection on Instagram this week. (Photo by Splash News and Pictures)

Bella Hadid attends the Los Angeles Lakers Vs New York Knicks game at Madison Square Garden on December 12, 2017 in New York City. (Photo by James Devaney/Getty Images)

Recording artists Demi Lovato (L) and Iggy Azalea perform on the Pepsi Stage, during the 2015 MTV Video Music Awards, at The Orpheum Theatre on August 30, 2015 in Los Angeles, California. (Photo by Frederick M. Brown/Getty Images for MTV)