Jessica Simpson is still refusing to confirm whether she has or is dating Smashing Pumpkins rocker Billy Corgan, but admits he is ''very, very dear'' to her.

Jessica Simpson says Billy Corgan is "very, very dear" to her.

The singer-and-actress - who has been romantically linked to the Smashing Pumpkins rocker since he helped her record the theme song, 'Who We Are', to her latest TV series 'The Price of Beauty' - says she and the musician have a special bond but refused to say whether the had or are dating.

She said: "I can't find good enough words to speak about Billy. He's a very, very dear friend. For him to give his time and his talents and share them with me, it was a great experience. And I hope we can do more music together."

Despite her troubled love life, Jessica - who has been in relationships with American footballer Tony Romo, womanising singer John Mayer and ex-husband Nick Lachey - is still willing to open up to new guys.

She added in an interview with Ryan Seacrest on his KIIS-FM radio show: "I'm not as guarded as you would think. I should probably be more guarded. I trust a lot of people, actually."

Jessica is also still angry with ex-boyfriend John for describing her as "sexual napalm" in an interview.

The 29-year-old star - who dated the 'Heartbreak Warfare' singer for nine months until May 2007 - said: "I still feel that with somebody that you have cared about for a long time you hope they can keep the intimate things intimate."