Enrique Iglesias has sparked rumors he has proposed to long-term girlfriend Anna Kournikova, after the tennis ace was spotted wearing a $6 million engagement ring.

The singer has previously refused to confirm the couple is engaged, but the sportswoman was photographed in London wearing a diamond on her left hand on Tuesday in London.

Earlier in the evening, the pair had enjoyed a romantic but unique meal in the capital - the chef at Japanese eatery Sapporo Teppanyaki lobbed food at the pair so they could catch it in their mouths.

Iglesias has been dating Kournikova since 2002, after she starred as his girlfriend in the video for hit Escape.

-More Anna Kournikova Pictures
-More Enrique Iglesias Pictures

(This news article provided by World Entertainment News Network)