It looks like Britney Spears has gone where many other new actresses have gone before (hold the jokes, kids). According to a report on the Internet Movie Database, while doing her cameo in AUSTIN POWERS 3, she flubbed more than a few takes by cracking up at Mike Myers' improves.
Particularly (and, ironically) the "pelvic dancing."
As Spears told the site, "I was so excited. I've seen the first two films and I think Mike's the funniest man in the world. It was hard to keep in character, trying to be this sexy vixen while he pelvic dances and cracks me up."
I can imagine.