Liv Tyler, Kate Upton, Sofia Vergara, Natalia Vodianova, Emma Watson, Rosie Huntingdon-Whitely, Olivia The goal of the video — which shows the ladies dancing in bras and undies to Demi Lovato’s hit “Confident” — is to shine light on “a powerful population of women who have been historically ignored and underrepresented.” Society as a whole has pretended that women over a certain age don’t exist. We want to celebrate women of all ages and really honor the fact that we’re beautiful at any age.” Elizabeth Robbins, 75, models lingerie for Knix. Sise Drummond

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Emily Ratajkowski, Bar Refaeli, Rihanna, Rebecca Romijn,Claudia Schiffer, Stephanie Seymour, Irina Shayk, Brooke Shields, Knix — an undergarment brand known for fashionable leakproof underwear — just released a lingerie campaign centered around women ages 50 to 81 in honor of International Women’s Day on Sunday.