Britney Spears wears a red Casio G-Shock GMAS110F-4A watch in the music video for “Pretty Girls,” a collaborative song with Iggy Azalea. She wears the watch throughout the video and there is a clear closeup of it as seen below. The GMAS110F-4A is part of the Rose G-Shock S Series for women and has a printed two-tone rose pattern on the straps. Unfortunately the song was considered a flop that had some drama associated with it. You can watch the video here.