Green’s Dictionary of Slang

(US) very attractive.

[1942		W. Winchell On Broadway 12 Nov. [synd. col.] The lovely likeness of Hotty Lamarr on the front of Pic].
1998		Eble Campus Sl. Apr. 5: hottie – good-looking: ‘Hottie boy is coming this way!’.
2002		D.H. Sterry Chicken (2003) 97: Six of the hottest of hottie thirteen-year-old babies in Lyndon Baines Johnson Junior High School.