How can I modify this query to fit my needs?

SELECT EMAIL, USERNAME, COUNT(*) AS C FROM REVIEWS GROUP BY EMAIL ORDER
BY C DESC

EMAIL may not be NULL, USERNAME may be NULL.

Example of rows in table REVIEWS:

EMAIL, USERNAME, CREATED
"someone@somewhere.com", NULL, 2004-12-01
"anyone@anywhere.com", "Anyone", 2004-12-01
"someone@somewhere.com", "Someone", 2004-12-11
"someone@somewhere.com", "SOMEONE", 2004-12-13
"someone@somewhere.com", NULL, 2004-12-16

Result of the query:

"someone@somewhere.com", NULL, 3
"anyone@anywhere.com", "Anyone", 1

I would like the result to be:

"someone@somewhere.com", "SOMEONE", 3
"anyone@anywhere.com", "Anyone", 1

since the latest not null value for the user with email
someone@somewhere.com is "SOMEONE".

Is that possible?

Leif