Spears, 34, posted two photos with Clinton on her Twitter and Instagram accounts, originally using the #ImWithHer hashtag on Instagram before editing the post and removing it.
The #ImWithHer hashtag is used by her endorsers and supporters on social media.
"Being in Vegas for #PieceOfMe is amazing for so many reasons... Especially when you get to meet @HillaryClinton!," Spears tweeted.
"Piece of Me" is the name of Spears' rolling show in Las Vegas, where she performs her hit songs from the last 15 years since she became a pop star.
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