Jessica Simpson is “on a budget” after her credit card was declined. The 41-year-old pop star had been trying to make a purchase at fast food chain Taco Bell but was unsuccessful and is now using cash as she joked that she is now having to budget while she waits for a new card. She said: “I have no working credit card. It’s OK. I will pay in cash. I went to Taco Bell the other day, and my card got denied. I’m on a budget, ladies!” The ‘I Wanna Love You Forever’ hitmaker – who has Maxwell, nine, Ace, eight, and Birdie, three, with her husband Eric Johnson – went on to explain that there is a “f…