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No one said being a pop star was easy!

Britney Spears appeared exhausted while exiting a dance studio in Thousand Oaks today. Despite the tired look on her face, the singer still seemed to be in high spirits as she walked to her car.

The songstress sported a completely different expression while posing for a SHAPE magazine cover spread in which she gleefully bent her body into yoga positions.

The former X Factor judge is most likely practicing routines for her new Las Vegas show that's slated to open this fall.

"The [Vegas] performances won't be simple -- they'll be a massive party from start to finish," she told SHAPE. "And to pull this off, I have to be in top condition and running at full speed."

Furthermore, Brit-Brit will be collaborating with will.i.am for her eighth album. The duo, who already teamed up for the songs "Big Fat Bass" and "Scream & Shout," have been meeting and clocking studio hours for the past three months. They're currently in the process of developing a more personal relationship with one another in preparation for the album:

    "Before we even start we've had these juicy sessions, where we've been bonding, building the trust and comfort. I've never worked like this before -- not even the Peas," will.i.am told Billboard.


They duo will begin recording music this week ... and we can't wait to hear a new track!