Britney Spears (search) canceled her summer tour Tuesday because of a knee injury she suffered in New York last week during a video shoot with Snoop Dogg (search) for her new song, "Outrageous."

Her knee gave out during the choreography, and she underwent arthroscopic surgery (search). She'll wear a hard brace for six weeks and will require at least two months of rehabilitation, according to a statement from her label, Jive Records.

Spears was scheduled to begin the summer leg of her North American tour, which featured plenty of choreographed dance numbers, June 22 in Hartford, Conn. It was to end in Bakersfield, Calif.

This isn't Spears' first injury. The 22-year-old was forced to cancel two shows in March because of a problem with her knee.

Spears' latest album, "In the Zone," was released in November and has sold more than 2.6 million copies.