Lily Allen has hit back at British reality TV star Katie Hopkins after she branded the singer "hideous". Hopkins, a former contestant on the U.K. version of The Apprentice, lashed out at the Smile hitmaker in an interview with Britain's Heat magazine, accusing her of piling on the pounds. She also suggested Allen is only famous because of her father, British actor and comedian Keith Allen. The comments have infuriated Allen who has now taken to Twitter.com to hit back, blaming her weight gain on comfort eating after she lost a child six months into pregnancy in 2011. The pop star, who has since given birth to daughters Ethel, two, and 12-month-old Marnie, writes, "Katie Hopkins: I am not famous for having a famous dad, I doubt that most of my fan base have a clue who my father is... Yes, after tragically loosing (sic) a child so late in to mypregnancy (sic) I may have gained a few pounds, I am one of many that find comfort in food. The two pregnancies that followed were terrifying because of what had happened before and I was pretty much on bed rest for 20 months. "I wasn't exercising because I didn't want to take any risks, and funnily enough, the survival of my children felt more important than being thin." Allen then took aim at the columnist directly, adding, "Can somebody tell me what Katie Hopkins does except go on telly s**gging off girls half her age? Ps Katie looks are obviously so important to you. There's always plastic surgery ya (sic) know. Maybe they could sew your mouth up while they fix the rest of you." She later added her parting shot, writing, "Oh , and whilst 'weighing me up'. Fat shaming, you were a stone out, I gained 3 not 2. And hey, look I'm on the cover of Elle this month!"