Sienna Xiong is an environmental engineer, beauty queen and model from Taiwan. She is one of the delegates in the 2025 Miss Cosmo beauty pageant to be held at the Creative Park in Ho Chi Minh City, Vietnam, on 20 December 2025.
Personal Information
Name –> Sienna Xiong
Birth Date –> N/A (Age 27 in 2025)
Hometown –> Taipei, Taiwan
Height –> N/A
Degree –> Environmental Engineering
Occupation –> Model
Beauty Pageant Career
2025 – Candidate, Miss Cosmo
2025 – Miss Cosmo Chinese Taipei
2020 – Miss United Nations China Champion
See also: List of Miss Cosmo 2025 Candidates