Christina Grimmie attends the 2015 iHeartRadio Music Festival at MGM Grand Garden Arena in Las Vegas, Nevada on Friday September 18, 2015

Ashley Tisdale attends the 2015 iHeartRadio Music Festival at MGM Grand Garden Arena in Las Vegas, Nevada on Friday September 18, 2015

Karrueche Tran’s simple and natural look: matte brown eyeshadows, black eyeliner and mauve lipstick

Victoria Justice wore a flawless natural makeup with brown eyes contoured with a subtle black eyeliner and velvet lipstick

Tove Lo wore a simple natural makeup: beige eyeshadow and hot pink lipstick

Tori Kelly at the People’s Ones to Watch 2015 at Ysabel, 945 N Fairfax Avenue in West Hollywood, CA on September 16, 2015

Sierra Furtado at the People’s Ones to Watch 2015 at Ysabel, 945 N Fairfax Avenue in West Hollywood, CA on September 16, 2015

Rita Ora seen leaving the Irving Plaza in New York City, New York on Tuesday September 15, 2015

Lauren Elizabeth by LA MUA Samuel Rauda highlighted her eyes in taupe and silver tones with black eyeliner and mascara and her lips in two shades of brown

Kylie Jenner and Tyga at the grand opening of Sugar Factory American Brasserie in NYC, New York on Wednesday September 16, 2015