The model and Celebrity Big Brother star marked the accolade with a new photo shoot for the magazine.
"People always talk about the 100 Sexiest - girls as well - and to think that you'd actually be in it!" Salpa said.
"I like Rosie Huntington-Whiteley - she won last year, didn't she? She's amazing, I love her. I like Megan Fox, I think she's really hot too."
Of spending half her time in London, the Irish star added: "I really like it in London at the moment. I live right in the centre, and there's something to do every night, loads of different parties. I love going out dancing with all the girls.
"I think English boys are more ballsy - they'll actually come up and ask you out. In Ireland, I don't get asked out much. English boys are a lot more flirty."
Salpa said: "I'm the kind of girl who always has a boyfriend. I am enjoying being single, though. I like confident guys, tall guys, guys who have all their s**t together.
"I like guys who wear nice clothes, nice jeans, nice trainers - I hate skinny jeans and those T-shirts that are really low-cut."
Salpa said last year that she would not rule out stripping naked for Playboy magazine in the future.
The June issue of FHM Magazine, including the full FHM 100 Women in the World supplement, is on sale from Wednesday, May 2.