Earlier this year during an appearance on The Dan Patrick Show, Earnhardt was asked why he hadn't proposed to Reimann and said, "I have a phobia that nobody knows about.
Now he's excited about making wedding plans, even as the 2016 season approaches.
Earnhardt and Reimann, who have dated for four years, are in Germany on vacation during the Sprint Cup series' off-week.
According to NASCAR.com, the picture accompanying her announcement is of the couple in a Lutheran church that Earnhardt's family attended seven generations and 300 years ago, he tweeted.
He's coming off two big seasons, is in the midst of a career resurgence and flashes a bright smile most everywhere he goes.
“It’s been great and I am going to really enjoy the process of putting that together with her and supporting her,” Earnhardt said Thursday during the Charlotte Motor Speedway Media Tour.
“Having her in my life has made my life an amazing thing,” he said Thursday.
“It’s a very cool thing and I am so frustrated with myself that I didn’t do it sooner because it’s as good as it gets.” Reimann has been a fixture at Earnhardt's side ever since the two began dating in 2009.He credits her with much of his happiness and optimistic outlook during the past two seasons, when he won seven Cup races, including the 2014 Daytona 500.