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Britney Spears

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Britney Spears is in the zone...again.

The 34-year-old pop princess is currently reworking her Piece of Me show before it returns Feb. 13 at The AXIS auditorium inside Las Vegas' Planet Hollywood Resort & Casino. To whet fans' appetites, she shared two sexy videos on social media Wednesday that showed herself and a troupe of dancers working out new choreography to "Breathe on Me," a fan favorite from her 2003 album In the Zone; the song was never released as a single. She quoted its lyrics in both video captions, writing, "It's so hot in here…" and "Just put your lips together and blow..."

(The latter lyric is a nod to Lauren Bacall's innuendo-filled line from 1944's To Have and Have Not: "You know how to whistle, don't you Steve? You just put your lips together...and blow.")

"Breathe on Me" was once one of Spears' concert staples, as she performed it during The Onyx Hotel Tour in 2004, the M+M's Tour in 2007 and the Circus Starring Britney Spears in 2009. While it wasn't on the original set-list, the singer's most recent Piece of Me show featured some of her biggest hits to date, including "...Baby One More Time," "Oops!... I Did It Again," "I'm a Slave 4 U," "Toxic," "Circus," "Hold It Against Me," "Work Bitch," and, of course, "Piece of Me."

When Spears announced she would be extending her residency through 2017, she told E! News she had "some major changes planned" for the show. "I'm getting together with my team this week to go over the set list, design some new costumes and dream up new props," she said in September. "There are a few songs that are fan favorites that I really want to add to the show."

So, what other songs will Spears add to her show? She has no shortage of hits to choose from—"3," "Gimme More," "Me Against the Music" and "Stronger" come to mind—but until Feb. 13, the Grammy-winning pop star is keeping her set-list a secret—that is, unless she tweets again.