sitter

1 ENTRIES FOUND:
sitter /ˈsɪtɚ/ noun
plural sitters
sitter
/ˈsɪtɚ/
noun
plural sitters
Britannica Dictionary definition of SITTER
[count]
1 
chiefly US : a person who takes care of a child while the child's parents are away : babysitter
2 
: a person who poses for a portrait or photograph