The chorus to Britney Spears and Iggy Azalea's Pretty Girls is reminiscent of the chorus to Nu Shooz 80's hit I Can't Wait (released February 1986), in terms of production/arrangement (synth sounds, bass line, claps/snaps on two and four, and tempo). In addition, the double-tracked (or Antares' effected) lead vocal is similar to Gwen Stefani's lead vocal sound in Hollaback Girl
The chorus to Sia's Elastic Heart featuring the Weeknd and Diplo (released October 1, 2013) has the same chord progression as the chorus to Little Boots' Remedy (released June 15, 2009). Both songs are in the key of A major and share close tempos (Elastic Heart: 130 bpm, Remedy: 129 bpm), and a common IV-I-V-vi (or 4-1-5-minor 6) progression, though their melodies differ.
Elastic Heart (1:01) VS Remedy (:29)
The chorus chord progression to Elastic Heart is also slightly reminiscent of the chorus to Big Time Rush's Nothing Even Matters, though NEM follows a IV-I-V-ii (or 4-1-5-minor 2) in the key of E major.