Britney Spears' ginormous expense report just got even bigger after a former bodyguard filed a lawsuit against the pop star and comeback queen.

Kerry Vine claims that he sustained physical injuries while working at the superstar's former home at the Summit in Beverly Hills in March 2008.

"Advanced Security Concepts ... negligently operated their business thereby causing injuries to [Kerry Vine] who worked for [Britney Spears] at the time," Vine's attorney, Charles Swain, wrote in his declaration of intent to sue.

"[Britney Spears] breached that duty of care to the plaintiff by failing to ensure that he could safely perform duties that he was ordered to perform."

If we had to juggle 10 lawsuits a week, we'd look this dazed too.

Britney Spears is thus being sued for personal injury, battery negligence for which the bodyguard claims he suffered lost wages, medical and hospital costs, loss of personal property and earning capacity. A hearing is set for September 2.

So what happened? According to TMZ, a source involved in the situation says that Vine worked at Britney's home a grand total of three days. On the last day of that brief tenure, he volunteered to move a small table with a few other guys.

He called in sick the next day, complaining of shoulder pain. He's been on worker's comp ever since moving that pesky table ... a year ago.