KIRSTEN DUNST: I'M NOT READY FOR MARRIAGE

COME INTO MY PARLOR . . .

Said the spider to the fly -- let's DENY! But "Spider-Man" Tobey Maguire CAN'T deny his sizzling love affair with co-star cutie Kirsten Dunst anymore -- he just POPPED THE QUESTION! On a romantic tropical vacation, Maguire told her she's IT for him -- but Kirsten nixed a permanent relationship, saying that at age 19, she's still too young to get trapped in anyone's web!