Britney Bombs at Billboard Music Awards

Britney Spears had two big appearances at last night's Billboard Music Awards—and "it wasn't good," snarks Matt Cherette for Gawker. The show opened with Rihanna performing her song "S&M" (complete with, oddly, "a bunch of random hands trying to caress" her crotch), who was joined by Britney half-way through. "Spears lip-synced (Rihanna sang live), danced like she had arthritis, and even managed to mess up a song-ending pillow fight," complains Cherette.

The embarrassment continued later when Spears reappeared for a performance during Nicki Minaj's set. "And by 'performance,' I mean an even-worse-than-the-first-one cameo," Cherette quips. Click to for more highs and lows from last night's awards show. (Or click here to read about how Rihanna flipped out at a 14-year-old on Twitter.)