「恋するカレン」is a song by 大滝詠一 from his 1981 album A Long Vacation. Lyrics for reference.
The part I am confused about is, who exactly is the actor i.e., person doing 恋する and who is it directed towards?
Possible translations I could think of
- Love Karen
- I love you Karen
- Karen in Love
1.Sounds too vague in my opinion. 2. doesn't seem like it because he could have used 恋しているカレン or maybe 愛しているよカレン instead to make it more obvious (I might be wrong here). 3. seems to be the closest translation when I eliminate 1 and 2