The couple, who have been dating since 2009, are in Germany researching Earnhardt's family lineage during an off week for Sprint Cup Series drivers.
As one of the sport's biggest celebrities, his personal life often is the subject of lifestyle and gossip articles, including one National Enquirer story last year that said he would have a $2 million wedding."I definitely would have a hard time writing that check," Earnhardt said at the time.
His sister, Kelley Earnhardt Miller, who is also on the trip, tweeted congratulations to the couple.
MORE: Key career moments | Junior quiets retirement talk | Sunday observations "Amy has been there every step of the way pushing me to stay focused and to realize the progress we have made and to keep working hard," said Earnhardt, who will miss the rest of the 2016 NASCAR season but hopes to return for 2017's season-opening Daytona 500.
He is making significant progress, however, and credits not only his doctors but also the help of his family and friends.
At the top of that list is his fiancée, Amy Reimann, whom Earnhardt says plays a key role in his recovery.
NASCAR's most popular driver is ready to say "I do."Dale Earnhardt Jr.
announced Wednesday morning that he and his longtime girlfriend, Amy Reimann, are engaged."Looking forward to the rest of my life with this amazing girl," Earnhardt tweeted, retweeting a photo Reimann posted of herself and Earnhardt, which showed an engagement ring on her hand, as they visited a Lutheran church that Earnhardt's family had attended seven generations and 300 years ago.
The couple first went public in December, 2011, at the NASCAR Awards in Las Vegas.
was "pretty sick" when he was diagnosed with a concussion eight weeks ago and faced a long, hard road while recovering.
April 2010 - Present It was first reported that Dale Earnhardt, Jr.
and Amy Reimann were dating by the 'National Enquirer' in April, 2010, while Amy was still married to another man.