The 22-year-old starlet clinched the top spot of least desirable female, after cheating on her long term love Pattinson with married director Rupert Sanders last year.
A spokesman for MenKind, who conducted the poll, said that their Oscars poll has been a fascinating insight into the minds of British men as it shows that sexiness is far more than appearance.
He added that men were turned off by volatile and moody actresses as well as ice queens..
Sarah Jessica Parker and Lindsay Lohan were placed at second and third place respectively, the Daily Mail reported.
Former Bond girl Denise Richards and Kirsten Dunst completed the top 5 list.
Top ten least sexy Hollywood actresses are
1. Kristen Stewart
2. Sarah Jessica Parker
3. Lindsay Lohan
4. Denise Richards
5. Kirsten Dunst
6. Mischa Barton
7. Hilary Swank
8. Lucy Liu
9. Tilda Swinto
10. Uma Thurman