LADIES’ man DALE EARNHARDT Jr. is finally getting hitched to longtime girlfriend AMY REIMANN after she gave him a blistering ultimatum.

For years, NASCAR’s most popular driver steered clear of marriage while dating a string of beauties, but that changed suddenly when Amy told No. 88 marry me or leave, say sources.

The 37-year-old racing superstar has been dating the 30-year-old beauty for 2 1/2 years in a low-key romance, but now Amy wants to put the pedal to the metal and start a family.

“Amy told Dale she wasn't going to be kept waiting in the wings forever,” revealed a friend.

“She told him she wants to get married after the current racing season is over and have a baby next year. “ T h e r e was no way Dale could say no since he can’t stand the thought of losing her.”

Insiders credit Amy’s steadying influence for helping to propel Earnhardt to one of his best-ever racing seasons.

Dale broke a 143-race winless streak in June, has scored 17 top 10 finishes – his most since 2004 – and is a leading contender for the p r e s t i g i o u s Sprint Cup as the sport’s all-around points leader.

“Dale has been named the most popular racer for 10 years in a row, but for a long time his accomplishments didn’t match his popularity,” said a source.

“He’s getting older and has realized you can’t be out in a bar five nights a week chasing women if you’re really serious about competing at the highest level.

“Having Amy to come home to at night has really turned around his life and his career. She’s beautiful and smart – and the best thing that has ever happened to him.”

Added the friend: “Dale would love to have a little son or daughter. He and Amy will be married before the end of the year.”