London: Singer and reality TV star Aaron Carter says he's not obsessed with actress Hilary Duff and hit back at critics for suggesting he still thinks about her after her following their split in 2003.

Carter, 26, who dated the “Chasing the Sun” hitmaker, 27, when she was 13, hit back at critics for suggesting he is still pining after her because he posted a photograph of himself watching an old episode of her Disney series, “Lizzie McGuire,” in which he kissed her, reports femalefirst.co.uk.