Is this possible: left join on table aliases?

[David Gibb]

mysql>select emp.*, sup.fname as supF, sup.lname as supL
from employee as emp, employee as sup, emp left join sup on emp.supid=sup.empid
where emp.username="dgibb";

Error 1066: Not unique table/alias: 'emp'


The table structure is pretty easy, the employee table has a primary key on empid, and a foreign key on supid(the empid of this employee's supervisor).

The result should give all employee fields, and if there is a supervisor attached to this employee record, give the first and last name.

My question is:
Is it even possible to a left join on the same table using aliases?, and if so, how?