London, June 25 (IANS): A warning will be flashed on TV before singer Adele takes to the stage for her headlining act at a concert in Glastonbury here on Saturday night over apprehensions that she may use x-rated language.

Although the 28-year-old is not due to take to the stage until late night, those watching it on channel BBC 2 will be warned, reports mirror.co.uk.

The singer is known for frequently uttering obscenities during her otherwise ballad-heavy sets.

“In between performing emotional ballads, Adele is completely herself on stage and tells some hilarious anecdotes. It’s all part of her charm," a source said.

“Swearing is in her vernacular, so it’s only natural she’ll be effing and blinding away. But even though her set will air in a broadcast that doesn’t begin until after 9 p.m. -- which is post-watershed-- it’s probably for the best that viewers are warned to expect a few naughty words,” the source added.

A spokesman for the BBC said: “As with previous years, all live post-watershed performances from this weekend’s Glastonbury will be prefaced with a warning for possible strong language.”