Tulisa's £100k metallic Audi was defaced with the offensive word last week after she had parked up and left it unattended.
According to The Daily Star, Tulisa had to pay to get the convertible motor towed away to the garage so the bodywork could be resprayed.
A source told the newspaper: "She's starting to feel like the whole world's against her.
"Tulisa prides herself on being good at coping with all the negative attention, but it's a different ball game when people are starting to mess with her private property."
Reveal contacted Tulisa's rep about the incident but he declined to comment.
Earlier this week, Tulisa's BFF Chelsee Healey spoke to us about her friendship with the N-Dubz star.
Proving Tulisa has an ally for life who she can trust, Chelsee admitted: "We're good girls, we deserve the best! Tulisa knows she can trust me 100%"