"doll", is a word used, to discribe pretty, beautifull, exquisite, adorable or just to tell someone that they are a nice person.
Also it is a word to discribe Alex, very well.
"hey russo, your sucha doll babe"
"honey i love you, your a doll"
"look at you in that picture, you doll"
"Andrew thinks Russo is a total doll"