"What Happened to Us" is a song by Australian recording artist Jessica Mauboy, featuring English recording artist Jay Sean. It was written by Sean, Josh Alexander, Billy Steinberg, Jeremy Skaller, Rob Larow, Khaled Rohaim and Israel Cruz. "What Happened to Us" was leaked online in October 2010, and was released on 10 March 2011, as the third single from Mauboy's second studio album, Get 'Em Girls (2010). The song received positive reviews from critics.

A remix of "What Happened to Us" made by production team OFM, was released on 11 April 2011. A different version of the song which features Stan Walker, was released on 29 May 2011. "What Happened to Us" charted on the ARIA Singles Chart at number 14 and was certified platinum by the Australian Recording Industry Association (ARIA). An accompanying music video was directed by Mark Alston, and reminisces on a former relationship between Mauboy and Sean.

"What Happened to Us" was written by Josh Alexander, Billy Steinberg, Jeremy Skaller, Rob Larow, Khaled Rohaim, Israel Cruz and Jay Sean. It was produced by Skaller, Cruz, Rohaim and Bobby Bass. The song uses C, D, and B minor chords in the chorus. "What Happened to Us" was sent to contemporary hit radio in Australia on 14 February 2011. The cover art for the song was revealed on 22 February on Mauboy's official Facebook page. A CD release was available for purchase via her official website on 10 March, for one week only. It was released digitally the following day.

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