The pregnant fashion designer was spotted sipping the fizzy energy drink between bites of Thorntons toffee during a recent shopping trip.
A source told the Daily Mirror newspaper: "She was shopping in Selfridges last week and stopped every few minutes for a toffee and a chug of orange pop."
The former Spice Girl - who turned 37 on 17.04.11 - is expecting her first daughter with her soccer player husband David Beckham, with whom she already has three sons, Brooklyn, 12, Romeo, eight, and six-year-old Cruz.
It seems Victoria`s cravings for sweet treats are evolving as early on in the pregnancy she was reported as having a particular penchant for marmalade on toast and tea.
A source said: "Victoria is having a lot of tea and toast with lashings of marmalade. She can`t get enough of the stuff. Mostly she`s been having it on toast, accompanied by lots of cups of tea."
To celebrate her birthday, she enjoyed a family lunch with David, their kids and her parents Tony and Jackie Adams in Beverly Hills` French restaurant Bouchon Bistro at the weekend.
She wrote on her twitter page: "Thank u so much for such beautiful birthday messages!!!! So many beautiful flowers and messages!!!! having a wonderful day with my four boys!!!! x vb (sic)"