Cameron Diaz and Benji Madden are engaged [1]! The couple reportedly took their relationship to the next level recently, though engagement rumors have been swirling for weeks. Last week, Cameron and Benji were photographed at JFK airport [2], where Cameron flashed a sparkly ring on her left hand. She's been seen wearing the thick gold band since the beginning of the month and was sporting the ring yet again for an outing in West Hollywood on Monday. She was solo for the afternoon stop, while Benji took care of his own errands in Beverly Hills the same day. Neither have commented on the exciting news, but they've apparently been going strong since May, when Nicole Richie [3], who is married to Benji's twin brother, Joel, set them up. Keep reading to see Cameron's new bling, and then check out even more celebrity engagement rings [4].