The fashion designer – aka Posh Spice – can be seen shaking her bottom from side to side and doing that famous finger point in a snap uploaded to her story.
Practicing in front of a mirror, Beckham captioned the snap: “When coffee gets you jazzy first thing!”
The 43-year old – who is currently in New York for Fashion Week – also speaks in the video, saying “Actually, maybe this is good!”
The 90s pop sensations are reuniting six years after their last performance as a band, as announced earlier this year.
At the end of January, the five – Beckham, Geri Horner, Mel B, Mel C and Emma Bunton – posted a series of snaps to their social media accounts showing the pals back together having fun.
Sources claim that a host of new projects are on the table, including a television talent show and endorsement deals.
An insider told The Sun: “This is the pop reunion no one thought would ever happen again. But after a long period of negotiation Victoria agreed the time is right to work on new projects this year.
“It’s very exciting because she has always been adamant she wouldn’t go back.”
The latest rumours to reach fever pitch include a tour of the UK and US as part of the reunion.