Lifestyle by Lydia Hawken, The Sun 4th Feb 2021 5:47 AM If you re anything like us and spend hours on TikTok every evening, then you ve probably already come across the Silhouette trend. The viral challenge shows women embracing their curves by posing against a door frame in their underwear while a dark red filter highlights their silhouette, Hundreds of videos using the #silhouettechallenge have racked up over 231 million views on TikTok. At the start of the clips, users usually film themselves in comfy clothes before turning the lights off, stripping down to their underwear and striking a sexy pose in front of a dimly-lit doorframe.