Los Angeles, March 23 (IANS): TV personality Rob Kardashian has made a disturbing comparison of his celebrity sister Kim to a psychotic murderer in the movie “Gone Girl”.

The 28-year-old star compared Kim to the character of Amy Elliott-Dunne, a psychotic murderer essayed by Rosamund Pike. This was done via a post on image-sharing platform Instagram, after Rob deleted every other picture from it on Sunday, reports femalefirst.co.uk

Alongside a photograph of Pike covered head-to-toe in blood -- from a gruesome scene in the movie -- he wrote: "This is my sister kim , the b**ch from Gone Girl,,, (sic)."

The post came just days after Kim wished him a happy 28th birthday via a heartfelt message online.

She had posted a throwback photograph of them in Las Vegas, and wrote: "Happy Birthday to my one and only brother Robbie!!!! I love you so much and can't wait to share so many more memories with you!"

The brother-sister duo reportedly fell out last year when he refused to attend her and husband Kanye West's wedding in Italy because he was reportedly so self-conscious about his expanding waistline.

Rob -- who has battled with his weight over the past year -- hasn't been seen in public for months and his sister Khloé Kardashian, believes he's suffering with "social anxiety."

Khloe said: "I just feel, especially over the last year, Rob has become very introverted and has a kind of social anxiety."