The singer has released five stills from the clip ahead of its full premiere on Friday, December 23.
The images show the star playing out the lyrics to the song by pouring popcorn over a couple in the cinema and joining them on a sofa.
'Want U Back' marks the third full single from Lloyd's debut album Sticks + Stones, which entered at number four on the chart last month.
The track follows the top five hit 'With Ur Love', which featured rapper Mike Posner, and promotional cut 'Dub on the Track'.
Lloyd recently confirmed that she had signed a US record deal with LA Reid's Epic label, adding: "He finds me quite funny. He said that I am very outgoing."
> Cher Lloyd will be huge in the US, says 'X Factor's LA Reid
View the five stills from the 'Want U Back' music video below: