Jessica who has been dating American football star Tony Romo since last November was leaving Los Angeles restaurant Chili's with her mom Tina when Tina revealed the 27-year-old star has secretly wed.
When asked if Jessica was planning to marry Tony, Tina laughed: "Jessica is already married to Tony! What are you talking about?"
Jessica, who was previously married to singer Nick Lachey, giggled and added to gossip website TMZ.com: "Well I guess if my mom said it, it must be true!"
Earlier this year, Tony admitted he was thinking about marrying Jessica -but not yet.
The 27-year-old Dallas Cowboys star said: "I'm sure I'll get married one day. I don't know when though."
Tony's close friend Michael Starr also fuelled wedding rumours by saying: "I think they are going to get married."
Meanwhile, Jessica has reportedly splashed out $3.47 million on a mansion in the Forest Hills' gated community in Nashville, Tennessee.
The property, which is known as The Queen of Northumberland, boasts seven bedrooms, eight bathrooms and a cinema.
A source said: "Although the gated community includes a private club house with tennis courts and swimming pool for all the other rich residents, The Queen of Northumberland quite naturally has its own pool and tennis court, which means that Jessica need not fraternise and frolic with the other well-booted music industry residents."
Jessica, who is currently working on a country album, wouldn't be the first celebrity to move to Nashville. Nicole Kidman and her husband Keith Urban and Sheryl Crow also own properties in the area.