Jessica Simpson has been warding off rumors about her pregnancy since long. It was last night when her mother Tina was seen helping her out of the car, that the shutterbugs got clicking and speculations were flamed yet again.

Jessica Simpson while lashing out at reports linking her with Tiger Woods twittered on Wednesday "I can't believe that I'm on the cover of star magazine with Tiger Woods, what a JOKE! The shocking inside story is a lie."

She also flayed the report that Woods tried to add her to his list of mistresses earlier this year.

Being scrutinized and criticized for her reported weight gain last month, saw Jessica Simpson tearing up and breaking down at a concert last week.

It seems there is more than weight rumours troubling the blonde singer, as while performing at a concert in Michigan on Thursday, she reportedly forgot lyrics, mumbled and seemed to be holding back tears for the 38-minutes she was onstage.

Four years ago, a vigorous fitness regime to fit into her Daisy Duke shorts, gave Jessica Simpson, 28, one of the top bodies in Hollywood . However, today the 5' 3" star, has given up her hard earned 36-24-36 figure, and she showed a distinctly curvier shape, as she sang tracks from her country album 'Do You Know' at a gig in Florida, over the weekend.