The actress was believed to have gotten betrothed after her Ghost Whisperer co-star Jamie Kennedy proposed live on stage at California’s Laugh Factory last weekend, but the marriage rumours have been dismissed.
Jennifer’s representative said: “There is no truth to the report.”
Jamie, who has been dating Jennifer since earlier this year, also blasted the engagements claims - insisting he would never have proposed in such an unromantic setting.
He wrote on his Twitter blog yesterday, "There's a lil rumor going round that i got down on one knee in Long beach. If i was gonna get down on one knee do u think i wud do it in the LBC? I mean i'm down with Snoop but L Beach dosent scream Romance. I luv my girl and wen it happens you'll be the first to know (sic)."
It had been reported comic star Jamie spontaneously got down on one knee during his performance at the Long Beach venue after an audience member begged him to propose to Jennifer last Saturday night.
A source said: "Jamie pulled Jennifer up to tell jokes and sing. Someone yelled out, ‘Marry her!' and Jamie got down on one knee and asked her to marry him. She said yes even though he didn't have a ring. They got a standing ovation."
Jennifer, who began romancing Jamie soon after she split from fiance Ross McCall, has previously spoken about her desire to settle down with her 39-year-old lover.
The 31-year-old actress said in May: "A timeline? By this time next year, if we're not planning something, then there's a situation." The couple met on the set of Ghost Whisperer in 2007.