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. 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. In a statement to TMZ, Kimmel claims the idea was his and he went forward with it because, “I knew they wouldn’t mind because I know they both have great senses of humor.”

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UPDATE: I found a clip of the “incident”…and I thought it was pretty freaking funny.  Do yourself a favor, and watch this clip.  Click on picture to watch the video.