Lily Allen has been spotted wearing an engagement ring.

The 24-year-old 'Not Fair' singer was seen enjoying a meal at London restaurant Quo Vadis with her boyfriend Sam Cooper, wearing a shining band.

"She looked determined not to have her picture taken with the ring on."

However, her spokesperson has denied she is betrothed to Sam, saying: "She often wears a ring on that finger."

Lily has been dating the 44-year-old builder since the summer, and she recently revealed they keep the romance alive in their relationship by taking mini-breaks in Europe.

She said: "If I'm on tour in Europe, Sam will fly out on a Friday night when he's finished work and stay with me for the weekend and then fly back on a Sunday. We talk to each other two or three times a day."

Lily recently claimed she was taking a two-year break from the music industry to focus on a fashion career.