Beyonce begins vegan diet again after shocking weight loss: Is a size 2

Beyonce appears to have started a second round of her 22-day vegan-diet challenge, judging by an Instagram photo she posted Jan. 29.

Beyoncé posted a picture of the 22 Days vegan protein bar along with the caption, "#22daysvegan." In December 2013, Beyonce and husband Jay-Z completed a three-week vegan diet challenge.

At the time, Jay-Z cited a desire for a "physical and spiritual" cleanse for their decision to eliminate gluten and animal products from their diets.

Go Vegan!!!

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Last week, Beyonce and Jay-Z performed at the 2014 Grammy Awards, where they raised eyebrows for their dramatic weight loss. Numerous media reports claimed the superstar couple had lost a combined 110 pounds on their 22-day vegan diet.

Beyonce's camp has not confirmed these extreme weight-loss rumors, but the Grammy winner is definitely super-skinny. She's now a tiny size two-four, according to "Project Runway" Michael Costello, who designed Beyoncé's sexy Grammy gown.

"The dress was just made to fit a sample mannequin," Costello told E! "It's smaller than a size four. Beyoncé is tiny! That dress is at least a 2/4. She looks amazing."

The 5-foot-7 Beyonce recently revealed she weighed 195 pounds while pregnant, and lost 65 pounds shortly afterward by following a strict diet and working out several days a week combining cardio exercise with strength-training.

"I was 195 pounds when I gave birth," she said. "I lost 65 pounds. I worked crazily to get my body back." Beyoncé's trainer, Marco Borges said she typically eats one vegan meal a day to maintain her weight loss.

“She eats one vegan meal a day, because this typically gets people to eat more greens than they normally would," said Borges. "Consistency is the key to success. I love running sprint intervals for quick cardio sessions and running stairs."