JOIN USThe 29-year-old singer, who has two sons, Sean Preston, five, and Jayden James, four, with second husband Kevin Federline, got secretly engaged to Trawick, 39, when the talent manager popped the question through a romantic poem, reported Sun online.
After filling the ground floor of the couple's Los Angeles mansion with roses and candles, Trawick reportedly presented Spears with a flower-shaped diamond ring. "She's on cloud nine," a source said.
The 'Toxic' hitmaker is also said to be keen to have another child, her first with Trawick, but only wanted to do it once she had tied the knot.
"Britney is desperate to settle down again and have more children. But she is very traditional and didn't want to start a family with Jason until they'd tie the knot," the source added.
Spears whose first marriage to childhood friend Jason Alexander was annulled just 55 hours after they said'I do' in Las Vegas in 2004, is now said to be planning a "low-key" ceremony in Hawaii once she has completed her upcoming world tour.