Beyonce, Jay Z Vegan for 22 Days: "Spiritual and Physical Cleanse

Ring the alarm — Beyonce and Jay Z are working on a new joint project. The superstar couple have pledged to take on a plant-based vegan diet for the next three weeks, the "Holy Grail" rapper announced on his website, Life + Times.

"Psychologists have said it takes 21 days to make or break a habit. On the 22nd day, you've found the way," Jay Z wrote by way of an introduction.

"On December 3rd, one day before my 44th birthday, I will embark on a 22 Days challenge to go completely vegan, or as I prefer to call it, plant-based!" he continued. "This all began a few months back when a good friend and vegan challenged me to embrace a 'plant-based breakfast' everyday. It was surprisingly easier on me than I thought…"

That friend was Marco Borges, an exercise physiologist and founder of 22 Days Nutrition, a vegan, organic, and gluten-free food and lifestyle company. Jay Z has called him "the world's best trainer," and Pharell says he's "a brilliant teacher of the idea that working out is not just a temporary fix to lose weight — it's a way of life."

According to Borges' website, 22 Days Nutrition is "a partner in the journey of Jay Z and Beyonce's exploration of a vegan diet." So why now?

"There's something spiritual to me about it being my 44th birthday and the serendipity behind the number of days in this challenge; 22 (2+2=4) coupled with the fact that the challenge ends on Christmas day," Jay Z wrote. "It just feels right!"

(Bey and Jay's obsession with the number four is well-documented; they were married on 4/4, Blue Ivy's middle name includes the roman numeral for four, and Beyonce's fourth album was titled simply 4.)

He went on: "So you can call it a spiritual and physical cleanse. I will post my progress…Any professional vegans out there that have any great food spots, please help out!" (In fact, the couple were spotted on Dec. 3 at Real Food Daily, an organic vegan eatery.)

As for whether this could be a permanent lifestyle change? "I don't know what happens after Christmas," he concluded. "A semi-vegan, a full plant-based diet? Or just a spiritual and physical challenge? We'll see…Best of luck and health!"

"P.S.," he added, "B is also joining me."

For access to all our exclusive celebrity videos and interviews – Subscribe on YouTube!