The Aston Villa star was unveiled as the latest footballer to collaborate with the popular brand following Manchester City striker Erling Haaland was announced last week.
Lehmann appeared on the company's social media page on Tuesday evening alongside the caption: "Welcome to the PRIME team."
The post features Lehmann, holding a football and a bottle of Prime while wearing a brand necklace alongside Paul and KSI.
The pair have tapped into Lehmann's worldwide appeal with the Switzerland international currently boasting a staggering 15 million Instagram followers, making her the most followed women's footballer in the world.
In joining Prime, she becomes the company's first female athlete.
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The 24-year-old toasted her new deal with a post on X, formally known as Twitter, saying: "Barbie girls drinks Prime", while KSI posted: "We ain't stopping! Absolute pleasure to have her be part of the team."
Lehmann has been at Villa Park since 2021 and recently extended her contract with the Midlands club until 2026 with the option of a further year.
After agreeing the new deal, Villa manager Carla Ward said: "Alisha has been a big part of our journey since I arrived and has played a huge part in our progression as a football club.
"She is a very important piece to the puzzle and is someone I thoroughly enjoy working with. We're delighted she's committed her long-term future with us."
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Paul and KSI launched the drink in the UK in January and it led to huge demand, with some so desperate for a bottle they paid over the odds for one.
As well as Haaland, they have since inked deals with UFC stars Israel Adesanya and Alexander Volkanovski as well as Premier League club Arsenal and Bundesliga champions Bayern Munich.