Hollywood Actors and Actresses (mostly Actresses) who I believe look stunning without makeup include:
Kate Beckinsale
Jessica Biel
Laverne Cox
Penelope Cruz
Salma Hayek
Audrey Hepburn
Stana Katic
Adam Lambert
Jared Leto
Jennifer Lopez
Marisol Nichols
Keke Palmer
RuPaul
Yara Shahidi
Gwen Stefani
Bella Thorne
Ariel Winter
Zendaya
Catherine Zeta-Jones
Sources: What 70 celebrities look like without a lick of makeup
18 Photos of Makeup-Wearing Male Celebs Without Their Makeup On
Images of Audrey Hepburn and Stana Katic taken from Pinterest