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On Feb. 19, NBC is celebrating its 90th birthday with The Paley Center Salutes NBC's 90th Anniversary, hosted by Kelsey Grammer. Ahead of the big day, ET is looking back on all our favorite couples from its many hit series. 'Friends' wouldn't have been the same without Ross and Rachel, but you also can't forget about Dr. Ross and Nurse Hathaway on 'ER.' Click through the gallery below to remember the lovers who ruled our TV for so many years, and be sure to tune into all the TV memories when Paley's salute airs 8 p.m. ET/PT on NBC.