The Toxic singer was forced to sit out two shows over the weekend (01-02May15) after taking a tumble during a performance last Wednesday (29Apr15), and as she prepares to return, she has added three months to her Piece of Me run.

Britney made the announcement during a surprise appearance on comedienne Ellen DeGeneres' talk show, which aired in America on Tuesday (05May15).

She also talked about her injury, which left her in a surgical boot over the weekend, explaining she tore ligaments when she fell.

Britney explained, "I actually wasn't doing anything that hard, I was just kind of bopping around, and I've done, like, eight years' worth of shows, plenty of shows, and I've never actually fell on stage (sic), so it was really kind of embarrassing.

"I got up, and my dancers guided me to keep going. So, not bad. The show must go on."