Britney Spears was the surprise guest at last night's 34th annual American Music Awards, but sources at TMZ say she was pissed off at a spoof sketch involving soon-to-be ex-husband Kevin Federline, masterminded by host Jimmy Kimmel, who swears he didn't know until the last minute that she was scheduled to be the surprise guest.

"She played it cool on stage, but Britney Spears was "pissed" at ABC over a derogatory sketch aimed at her estranged husband, Kevin Federline, during last night's "American Music Awards," a Britney rep tells TMZ. E!'s Marc Malkin first reported Brit was upset, and now a rep for Brit tells TMZ, "She had no idea" that the skit would immediately precede her appearance. We're told Britney was "incredibly upset" and "inconsolable." The sketch featured AMA host Jimmy Kimmel sealing a Federline look-a-like in a wooden crate and shipping him out to sea. Kimmel called K-Fed,"the world's first ever no-hit wonder." Less than five minutes later, Kimmel introduced Spears as a surprise presenter.When contacted, a rep confirms to TMZ the idea for the skit was Kimmel's and he went forward with it because, "I knew they wouldn't mind because I know they both have great senses of humor."

Performers at the AMA's
The women arrive at the AMA red carpet...
...and so do the men, but in smaller form, and less fashionable.

And don't let this post fool you, I totally didn't watch the AMA's. I think it's a mediocre production at best, and all the stars seem disinterested to be there. I personally prefer any MTV -affiliated awards show as it embraces its pointlessness and gets down to the nitty gritty: nip slips, same-sex kissing, and flagrantly vain acceptance speeches. All these pics are from Popsugar.