Jessica Simpson surprised boyfriend Tony Romo with a custom speedboat appraised at $100,000 when the Dallas Cowboys quarterback turned 29 last month.

Spies with The National Enquirer claim Tony, who celebrated his b-day on April 21, was stunned to receive the pricey gift from his loving girlfriend, who had the boat shipped to the Dallas estate where the couple live.

“Tony loves speed, and with all of the horsepower in his new boat, he can go as fast as anyone on the lake,” says a pal, who adds, “Jessica knows that Tony has always wanted a boat.”

The boat is described as a 25-foot Malibu Wakesetter, with 450 horsepower motor and a stereo system.

Tabloid insiders say Jessica is hoping her act of gratitude will be followed up with an engagement ring one day soon.

“Jessica is hoping that a birthday gift to Tony will lead to marriage, and by this time next year that she’ll be walking down the aisle with him.”