Turtle graphics, draw a filled star?

I want to draw a filled-in star, such as:

I have this code so far:

def draw_star(size,color):    count = 0    angle = 144    while count <= 5:        turtle.forward(size)        turtle.right(angle)        count += 1    returndraw_star(100,"purple")

I want to fill in the star with whatever color the function is passed. How can I do this?