It ain't easy being a pop diva.

Britney Spears received four stitches after a piece of equipment fell on her head during a video shoot. Part or all of a camera fell on the young singer while she was shooting a clip with director Nigel Dick for "Oops... I Did It Again" on March 18 in Universal City, California.

Britney's mother posted a message on the singer's official Web site (at www.britneyspears.com) that says the singer began bleeding from the head and that a doctor was called to the set.

Spears' mother goes on to speculate that the singer had a concussion and says that after four hours of rest she was able to return to work on the video. Spears' mother adds that after the shoot, the young star flew to Grand Rapids, Michigan and slept for 17 hours before performing there on March 19.

These are the times that I worry most!" Britney's mother Lynne writes on the site. "I worry about

her pushing herself too hard because she's a perfectionist. I worry about those freak accidents that seem to occur when you work crazy hours. I obsessively worry about her flying so much. And, of course, all of the above happened this week.

Spears' record label, Jive Records, had no official comment yet, and representatives for MTV's "Making The Video," who were documenting the shoot for an upcoming episode, were not immediately available for comment. That episode of "Making The Video" airs on April 10 at 10:30 p.m.