And Britney Spears was no doubt in need of a pick-me-up after yet another day of punishing dance rehearsals on Monday.
The 31-year-old singer was seen looking tired as she sipped a green drink from Starbucks while leaving a dance studio in Los Angeles.
The pop star wore grey tracksuit pants and a baggy white T-shirt, an orange bra peeking out at the top.
The mother-of-two wore grey-and-purple trainers and scraped her hair back into a messy high ponytail.
She looked somewhat tired, and her thick black eyeliner only highlighted her drawn face.
On Saturday, Britney showed off her newly svelte figure in tight jeans and a super clingy red turtleneck as she joined ex-husband Kevin Federline at their son Jayden's soccer game.
The former Mousketeer's two-year residency with Planet Hollywood Resort and Casino in Las Vegas is set to begin December 27.
When Britney recently mentioned that she wanted Sean Preston to join her onstage, Federline was on the apprehensive side.
'We'll see about that won't we,' Kevin told TMZ, adding he'd approve if his son 'was like 25 years old.'
The wannabe rapper doesn't plan on being present for his ex's show, saying: 'Nah man, not my thing. When I'm in Vegas I'm at the craps table.'
Britney, meanwhile, has been working on her eighth studio album, titled Britney Jean, which is slated for a December 3 release.
She has referred to it as her 'most personal record yet' and counts producers Sia, William Orbit, and will.i.am among her collaborators.