The couple, who split at the beginning of the year, "are working on things between them," according to the source.
Spears, 19, and Aldridge, 20, were spotted spending time together this week, catching Lady Gaga's concert Wednesday night in Los Angeles with Britney and her boyfriend, Jason Trawick. They also spent time hanging out at her older sister's house in Calabasas, Calif.
After calling it quits with Aldridge, Spears moved out of the Liberty, Miss., house she shared with him and their 2-year-old daughter, Maddie, and quietly began dating Louisiana businessman James Watson.
The former Nickelodeon star and Aldridge previously had planned to get married and set up a house together after she gave birth.
Reporting by JENNIFER GARCIA and PERNILLA CEDENHEIM