Little Bee smells faintly sweet, too. Nobody in my house wears perfume, and she doesn't get baths, so it's just her. My theory is that, since she grooms herself quite a bit more than other cats I've had (her coat is also the softest of any cat I've had), it's her saliva that smells sweet once it's dried on her hair.
In fact, I just googled it (been meaning to do it for awhile now!) and found this:
Considering how much grooming your cat does, and how her breath smells after she’s just had a good meal, it’s quite impressive that cat fur smells so sweet. Some people describe the smell of a healthy cat’s fur as being like fresh-cut hay. The reason for this is that cats’ saliva contains a deodorizing component.
Grooming is not only a hygiene aid, it’s a survival necessity. After a cat has eaten his prey, he licks himself clean to remove all traces of his last meal. The deodorizers in his saliva keep him from alerting other prey that a predator is nearby and help to keep him from becoming the victim of a bigger predator.