By Alexis Tereszcuk - Breaking Celebrity News Senior Reporter

You don’t mess with a heavily pregnant mom-to-be!

On the premiere episode of Fashion star Tuesday night, Jessica Simpson showed that she’s not going to take an insult lightly, ripping into a “sexist” contestant – and Breaking Celebrity News has video of her take-down!

Jessica and her co-host Nicole Richie critiqued Australian model-turned-designer Nicholas’ leather jacket collection and he snapped, “It’s very hard to understand the g