"Les Mis" star Anne Hathaway

The 'Pretty Hurts' singer, who surprised her fans by unveiling her new self-titled "visual album" exclusively on iTunes in the early hours of Friday morning, ran into the Oscar-winning actress at vegan restaurant, Café Gratitude, in Los Angeles last week, and gushed about her love of the 'Les Miserables' star, who was left a little starstruck.

An eyewitness told UsMagazine.com: "She said to Beyonce, 'I love your music.' And Beyonce told Anne, 'And I love your movies and I cry every time I watch them!' "

The duo bumped into each other at the organic eatery after Beyonce, 32, brought her husband, Jay Z, there to celebrate his 44th birthday on December 4.

The rapper recently revealed the couple, who have a 23-month-old daughter, Blue Ivy, are sticking to a plant-based diet until Christmas Day.

The 'Holy Grail' hitmaker wrote on his Life and Times Blog: "It just feels right! 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! Please! I don't know what happens after Christmas. A semi-vegan, a full plant-based diet? Or just a spiritual and physical challenge? We'll see. P.S. B (Beyonce) is also joining me."