The 24-year-old reality TV star was left "upset" when she was told she wasn't needed to promote 'Just Go With It' - in which they both appear - on the red carpet in New York this week because she was "too polarizing"
Heidi, who claimed she designed a dress especially for the occasion, said: "I'm so upset. I was so excited! This is the first movie I've ever been in and I can't walk the red carpet because Jennifer Aniston decided I was 'too polarising'.
"I've been such a huge Jennifer Aniston fan my entire life and it's just really upsetting that she would do this to me."
The former 'Hills' star - who is married to Spencer Pratt - insists Jennifer should be more understanding of someone who is new to the film industry.
She added to Us Weekly magazine: "She should know how hard it is to make a career for yourself and to have someone like Jennifer Aniston go out of her way to make things hard for me is really disheartening."
However, a spokesperson for Jennifer has dismissed Heidi's allegations, insisting the 41-year-old actress had no authority to decide who was allowed at the premiere.
Her representative said: "This is absolutely false, Jennifer has nothing to do with who was or was not invited."