Polina Grentz, born on October 28, 1994, in Vorkuta, is a Russian actress, blogger, and singer known for her role as Sasha Mamaeva in the TV series Fizruk (2013–2017). She gained attention through her YouTube vlogs during school, leading to successful auditions without formal acting training. Following Fizruk, she appeared in films and series such as Vse Slozhno (2014), Tet-a-Tet (2019), Ograblenie po Tarifu (2019), Dva Kholma (2022), Eskortnitsa (2023), and Moskva — Kaiir (2025). In 2025, she shifted focus to theater with productions at Abbey Players.
In addition to acting, Polina launched a music career with the track Malina and maintains an active presence on Telegram, Instagram, TikTok, and VK, sharing content about her lifestyle, travels, and sports activities. Her career path highlights success achieved without formal education, demonstrating versatility across multiple creative fields.