Adele was once close to "rolling in the deep" with an alcohol problem, according to a new biography.

In Marc Shapiro's "Adele: The Biography," the author details a time when the singer struggled with a drinking problem that left her visibly intoxicated while performing onstage.

"I got so drunk by the time I went on at 2 a.m. I had forgotten the words to my own songs ... It was the worst thing ever," the 24-year-old singer told Shapiro in an interview, according to In Touch. "Midway through her first tour, she allegedly had a drinking problem," he says.

But according to Shapiro, it was the heartbreak that made Adele a global household name that fueled her alcohol dependence -- an addiction her estranged father similarly suffered from.

"Adele would drink more than normal to salve the heartbreak," Shapiro writes.

But since finding success as every 20-something's soul sister, the singer has been able to bench her demons -- and, in the process, play guardian angel to a special fan.

After a 7-year-old British girl suffered from a brain hemorrhage that left her in a coma in mid-April, she miraculously awoke with a smile when Adele's "Rolling in the Deep" began playing on the radio in her hospital room.