Falcone, whose girlfriend and TOWIE co-star Lucy Mecklenburgh came 67th in the list, suggested that the former N-Dubz star's victory was a "fix".
Writing on Twitter, he exclaimed: "Do not understand how Tulisa won FHM 100 sexiest women.... Must be a fix!!!"
Contostavlos's pole position in the lads' magazine poll, ahead of the likes of Cheryl Cole and Rihanna, has led to a backlash on the social networking site, with the hashtag #womensexierthantulisa currently trending.
Speaking about her victory, Contostavlos declared: "It's a true honour and definitely a lovely confidence boost. I'm proud of me and I am who I am. I know that I'm Marmite and I wouldn't wanna be anything less or anything more, I'm just myself."
The 'Young' singer and X Factor judge recently hit the headlines for starring in a sex tape with ex-boyfriend MC Ultra.
The Top 10 of FHM's '100 Sexiest Women In The World' in full:
1. Tulisa Contostavlos
2. Cheryl Cole
4. Rosie Jones
5. Georgia Salpa
6. Katy Perry
7. Megan Fox
8. Keeley Hazell
9. Mila Kunis
10. Emily Atack