She's single and she's sizzling.

That's what other singers said of Britney Spears, who showed up onstage at the American Music Awards in a cleavage-baring dress to present the best female soul-R&B artist award just after a skit parodying her recent ex, Kevin Federline.

"She looked great. She got back on the horse, in my opinion," said presenter Jesse McCartney backstage.

Singer JoJo, wearing a flirty pink dress, said backstage that she supported Spears, who recently filed for divorce from Federline, described by AMA host Jimmy Kimmel as a "no-hit wonder."

"She's still a young lady, so she definitely has the opportunity to come back," said teen star JoJo, adding that she first met Spears when she was 7 and an aspiring musician.

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