The 27-year-old 'Smile' hitmaker joined rapper Professor Green during his slot at the second day of the cult band's three homecoming shows at Manchester's Heaton Park.
Introducing the singer to duet on their hit single 'Just Be Good To Green', the star told the crowd, "Manchester, make some noise for Lily Allen." Following the show, Allen took to Twitter and said, "No professorgreen (sic) wasn't swinging a cat around on stage (at) HEATONPARK that was me trying to sing. loved it, thanks manchester (sic)."
Allen announced in 2010 that she was taking an indefinite break from music to concentrate on starting a family with her then-boyfriend Sam Cooper. They married in June last year and Allen gave birth to daughter Ethel in November.