says his "head moves too fast" when he is with a girl he likes.
The 21-year-old singer - who makes up The Jonas Brothers
with siblings Joe and Nick - admits he can't control himself around attractive women.
He said: "I have to calm myself down because I get excited. My head moves too fat and my words don't come out as fast
as my brain is working. I'll even miss words when I am emailing or texting and it makes no sense!"
Kevin also revealed he never feels pressurised to be "macho" around women he likes.
He added: "Sometimes there is pressure to be tough, but I think it has a lot to do with jealousy - like, when other guys come around and stuff like that. For me, I'm not a jealous guy. I'm more of a protective guy."
The Jonas Brothers' new single 'Lovebug' is out now.