Lauren Reed was an agent with the NSC who was actually a spy working for The Covenant. As part of her cover within the US government, she married CIA operative Michael Vaughn while Sydney was missing for two years after being kidnapped.
Lauren was eventually uncovered and killed, but not before delivering a final bombshell for Sydney.
Part of the whole concept behind her is not character disguises where she’s got a big nose or fake teeth – it’s character disguises in high fashion mode. Just different versions of a beautiful Jennifer.
The makeup and hair credits listed at IMDb include: Michael Reitz, department head hair stylist & wig designer; Katherine Rees, key hair stylist; James MacKinnon, makeup department head; Angela Nogaro, makeup department head; Diana Brown, key makeup artist; Rela Martine, key makeup artistl; Gil Mosko, special makeup effects artist; Margie Latinopoulos, special makeup effects artist.
It’s just a shame she spent so much time in either in dimly lit nightclubs and other darkened rooms or else running or fighting.