dynamic insert in plpgsql

Is there any nice way to do something like that in plpgsql:

  EXECUTE 'INSERT INTO '||partition_table_name||' VALUES'||(NEW.*)||'';

It would probably work, but some values are NULL, and plpgsql
interpreter just puts empty space there. So I get ('1',2,3,,,); Which
obviously is confusing INSERT.

thx.

--
GJ