the girl next door

US /ðə ˌɡɜːrl nekst ˈdɔːr/
UK /ðə ˌɡɜːrl nekst ˈdɔːr/
"the girl next door" picture
1.

a very ordinary, conventional, and wholesome girl or young woman, especially one who is considered attractive but not glamorous

:
She's always been the girl next door, friendly and approachable.
Despite her fame, she still has that innocent girl next door charm.