In case you wanted to know...
Late afternoon light through an open door and diffused it using a white plastic grocery bag.
You can hardly see the bag because the it's blown out here in the shot...
I clipped it to the board in back and held it across the sunlight with my hand.
The background is foam core board, I used it as a staging area. The foam core on the right was used as a bounce.
To get the seamless background look I used an 8.5 x 11 sheet of paper curled into a backdrop.