Pop superstar Beyonce is adopting a strict vegan diet for the second time in two months.

The Crazy in Love singer and her rapper husband Jay Z quit all animal products last month (Dec13), and Beyonce is hoping to keep up her healthy eating habits once again.

On Wednesday (29Jan14), Beyonce took to Instagram to post a photo of a vegan protein bar with banana slices, alongside the caption "#22daysvegan".

The singer's post comes days after she showed off a slimmer figure while performing her song Drunk in Love with Jay Z at the Grammys last Sunday (26Jan14).

The couple's first round of the vegan challenge kicked off on the Holy Grail hitmaker's 44th birthday on 3 December (13), and Beyonce kept her fans updated on the diet by posting photos of their vegan meals online.