On what page or chapter does Humbert talk about him being attractive to Lolita (when he says he resembles famous people she has a crush on)?
Nabokov indeed portrays Humbert as being conscious of the fact that he can be very attractive for a preteen girl. He figures himself as a living personification of the male movie stars Lolita admires most. He literally says: "I have all the characteristics which, according to writers on the sex interests of children, start the responses stirring in a little girl: clean cut jaw, muscular hand, deep sonorous voice, broad shoulder. Moreover, I am said to resemble some crooner or actor chap whom Lo has a crush." (34) This occurs in Chapter 11. Later on, Humbert notices a poster of a handsome model in Lolita’s room: “Lo had drawn a jocose arrow to the haggard lover’s face and had put, in block letters: H.H.” (69)
Nabokov, Vladimir (1989), Lolita, New York: Vintage.