The 35-year-old former Pussycat Dolls singer had apparently turned down Hamilton's proposal on three previous occasions, reported Daily Star.
This time the Formula 1 racer popped the question at his Swiss mansion where the pair will apparently settle down after their wedding.
"Lewis will be the main breadwinner when Nicole is not working and she will always have access to his private jet if she needs to travel," a source said.
"It is the ideal plan for both of them and will hopefully lead to a big summer wedding in August when Lewis has a three-week break from his F1 schedule," the source added.
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