London, Dec 14 - Comic actor Russell Brand has sparked speculation that he is planning to propose to his singer girlfriend Katy Perry after he went shopping for a diamond ring recently.

Brand has been dating Perry since October after they met at the MTV Video Music Awards function, reported contactmusic.com. He has spoken frequently of his deep feelings for the "I Kissed A Girl" hitmaker, admitting: "I am in love."

Recently he was photographed browsing diamond rings at top London jewellers Cartier.

"His face lit up when he saw this one diamond ring. He put it on his hand and he just gazed at it for ages, deep in contemplation," said a source.