The progress of beauty

Fielding's narrator, of the character of Mrs. Partridge, in Tom Jones (the reference is II.iii.78):

Whether she sat to my Friend Hogarth, or no, I will not determine; but she exactly resembled the young Woman who is pouring out her Mistress’s Tea in the third Picture of the Harlot’s Progress.

And here is the relevant plate (from the Tate Gallery website):

The whole series is here.