Jessica Gets Mistaken for Carrie!

(Wireimage)

Jessica Simpson has been making her feelings about Carrie Underwood be known with her anti-vegetarian stance emblazoned on a shirt, so it's safe to say she wasn't too happy when she was mistaken for her foe!

Following lunch with pals at Dos Caminos in NYC’s SoHo on June 11, Jess, 27, returned to her hotel, where a girl asked for her autograph.

“She said she was her number-one fan from back in the Idol days,” an eyewitness tells OK!. “Jessica smiled politely and didn’t correct her, and she started to laugh when the girl asked how she was doing since her devastating split from Chace [Crawford].”

Ouch.

Jess didn’t end up giving her John Hancock, and though she took it all in stride, a pal tells OK!, “She wasn’t pleased that the girl had no clue who she was!”