"When She Was Mine" is the debut single released by British pop rock band Lawson, via Polydor Records.

Directed by Declan Whitebloom at a total length of three minutes and forty-seven seconds.

The video features the band performing the track in a high-rise building, looking out onto the street below, where a girl and her new boyfriend are courting.

Lawson explained that the song was formed on the basis of the relationship between band member Andy Brown and his ex-girlfriend, Mollie King of The Saturdays.

Lewis Corner of Digital Spy gave the song a positive review stating: "What I miss the most/ Is talking up all night/ We laughed until we cried," Andy reminiscences over pop-rock guitars and beats that fall somewhere between the soul of Maroon 5 and The Script's knack for a worryingly catchy melody.