Washington, Apr 9 : `American Idol' contestant Kellie Pickler's flirty relationship with music mogul Simon Cowell has raised many eyebrows, especially after the judge called her a "naughty minx".

The bonding the two shared is said to have caused problems with Cowell's then-girlfriend Terri Seymour, and for Pickler making a guest appearance on the FOX show has left her feeling nervous.