Did Jessica Simpson try to start a food fight with Tony Romo’s ex Carrie Underwood?

The singer, 27, wore a “Real Girls Eat Meat” T-shirt (which she got for free from steakhouse Primehouse New York) during a weekend outing with Romo, who dated Underwood in 2007.

Underwood was named PETA’s Sexiest Vegetarian in 2005.

PETA quickly jumped to Underwood’s defense.

“Jessica Simpson’s meaty wardrobe malfunction makes us thankful that no one is looking to her for food advice. Chicken-of-the-Sea, anyone?” a PETA rep tells Joynews. “The woman who thought that Buffalo ‘Wings’ came from buffalos would benefit from some good veggie brain food.”

Adds the rep: “We’re rushing Jessica one of our Vegetarian Starter Kits.”