This portrait, painted by Hans Holbein the Younger, may be Henry VIII's fifth wife, Catherine Howard, although the identification is controversial. It does strongly resemble a miniature portrait also identified as Catherine Howard (see the second image below).
Source: Wikimedia Commons. According to the Wikimedia site, this image is in the public domain.
And here's the miniature that also may (or may not) be Katherine Howard, painted by the same artist: