The Saturdays singer split from model boyfriend David Gandy earlier this year and is now the only single member of the group.
"I've heard Tom Cruise is single - but just imagine if I rang home and said, 'I'm going out with Tom Cruise!' My mum would fall off her chair."
She added: "I have a weird crush on Simon Cowell.
"The first night in LA we went to Soho House and sat just a few tables away from John Mayer, and I love him!
"I really wanted to go over there. I moved seats so I could spy on him."
She added: "People assume that celebrities are inundated with requests for dates, but it's not true!"
"I'd like to meet someone in the US. American men do interest me, but I don't really mind where they're from, I just want a nice one!"