EXCLUSIVE: Jennifer Aniston's Mystery Man Revealed -- He's Lindsay's Ex

Aniston and Morton appeared to be flirting as she touched his arm several times, sat next to him and they looked at photos together.

Eyewitnesses said Jen looked "a little nervous, putting her hair up in a loose bun and laughing at everything he said" while at an intimate corner table with Morton.

Although Morton is only 29-years-old, this isn’t the first time Aniston, 41, has been linked to a younger man. Her on-again-off-again ex John Mayer is nine years her junior.

"When her mystery date left for the restroom, she took the opportunity to primp by reapplying her lipstick,” an eyewitness told RadarOnline.com of Aniston’s dinner with Morton.

In true gentlemanly style, Morton picked up the tab before taking to the wheel of his Jeep four wheel drive while Aniston slipped out a back door under tight hotel security to avoid the waiting paparazzi.

radar_embed service=5min.com src=" http://pshared.5min.com/Scripts/PlayerSeed.js?sid=1126&width=486&height=412&playList=517712014&sequential=1&shuffle=0"