Justin, 30, won the award for Outstanding Guest Actor in a Comedy Series for his appearance as the host of US programme Saturday Night Live, as well as the award for Outstanding Original Music and Lyrics for co-writing Justin Timberlake Monologue for the show, while Gwyneth, 38, won the award for the Best Guest Actress in a Comedy Series for her stint in musical-comedy Glee as Holly Holliday, according to the Hollywood Reporter.
Timberlake's wins were announced during the Creative Emmys on Saturday ahead of next Sunday's Primetime Emmys.
Another big winner on the night was TV show Boardwalk Empire which won prizes for art direction, make-up and picture editing.