Hot damn! Finally nailed a white background! Yippee!

Nikon D750, 85mm, ISO 100, f/7.1, 1/125 sec (SOOC with just a tweak on the eyes and sharpening added in LR)

Two background SB-700 flashes with flags to help control spill positioned at 7:50 (the left light) and 3:10 (the right light) both pointing back at the white seamless and flash power set at 1/4 power.

Key light was an SB-910 set to 1/4 power in a Wescott Rapidbox positioned at 5:25. Camera was on a tripod triggered with my remote. 

SOOOO happy to have that third light! Thank you, Mother's Day Fairy!