United Kingdom, Jan. 7 -- Hilary Duff's husband had launched a scathing attack on "self-obsessed" Ashley Tisdale.

Matthew Koma has hit out at the High School Musical actress after she called out "mean-girl behaviour" from her "toxic mom group" in an essay for The Cut, which had led to speculation she was referring to fellow famous parents Hilary, Mandy Moore and Meghan Trainor.

The 38-year-old musician - who has Banks, seven, Mae, four, and Townes, 20 months, with the Lizzie McGuire star and is stepdad to her 13-year-old son Luca from her marriage to Mike Comrie - shared a photo of himself photoshopped onto Ashley's body, dressed in black with pink-tinted sunglasses.

The image was accompanied by The Cut's logo and a fake headlie nwhich...