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“I love you, Britney,” one fan called out. “We all love you, Britney,” chorused others.

She went from child performer to international star with her 1999 debut album, “Baby One More Time.” More hits followed, including “Oops! … I Did It Again” and “Toxic,” but her life was difficult, including rehab spells and time in a psychiatric ward.

Last fall, as she toured in support of her seventh album, the hit “Femme Fatale,” she told The Associated Press in London: “I hear the older you get, the wiser you get and the more you know what you want _ so hopefully it’ll be a good year.”

Lovato, who has faced her own personal challenges, looked at ease on “X Factor.” The 20-year-old singer showed poise, warmth _ and a sense of stagecraft.

A contestant told of being bullied in school and taking comfort from Lovato’s own challenges and her anti-bullying efforts. When the young woman, who wowed the judges with her performance, broke down sobbing, Lovato beckoned her over for a long hug.

During a Q&A Tuesday, an audience member asked Reid if it was important to make sure aspiring stars can avoid the pitfalls of fame. It’s impossible to predict who will withstand the pressure, Reid replied, then lauded both Spears and Lovato as the “complete package” of talent and personality.

The two-hour “X Factor” season debut, airing 8 p.m. EDT Wednesday, is followed by a second episode Thursday.