Britney Spears is off to a rocky start, as one of two new judges on ‘The X Factor’. According to sources, Spears is headed for another public meltdown as she takes on the judging role in the reality talent show. “Doing ‘X Factor’ may lead her back into meltdown territory,” a magazine has quoted a source as saying. “She gets extremely nervous and anxious. She’s hard on herself and not very confident,” the source said. Even positive developments like her engagement to Jason Trawick, 40, can send her over the edge. “For her, it’s all an input as stress. This is a lot of change at once for Britney. She’s coming undone,” the source said. To her credit, Spears-who has sold more than 100 million records worldwide-has slowly rebuilt her career since her 10-day stay in the UCLA Medical Centre psychiatric ward in early 2008. Her two post-crisis albums, 2008’s ‘Circus’ and 2011’s ‘Femme Fatale’, went platinum, and she spent seven months on tour promoting the latter. “Jason and Britney’s family wouldn’t let her do ‘X Factor’ if she couldn’t handle it,” an insider countered. “At first they weren’t going to let her because she couldn’t do live TV-they didn’t know what she would say. But they went over it with Britney, and they trust her,” the source said. ‘X Factor’ creator and fellow judge Simon Cowell, 52, isn’t worried about Spears’ unpredictability. “The network is using Christina Aguilera on ‘The Voice’ as an argument for her,” an industry insider said. “They’re saying the show needs a bankable pop star who will get viewers watching, whether they think she’s ridiculous or whether they love her. It’s definitely about tapping into Spears’ fan base.” Despite her nerves, Spears “wants to do a good job,” a source insists. “There is always apprehension about something you haven’t done before, but she’s looking forward to proving all the doubters wrong,” the source said.