Paris Hilton has sparked further speculation she is involved with the Good Charlotte's Benji Madden after she was snapped with a ring on her third finger, left hand.

The heiress has been dating Good Charlotte rocker Benji Madden for only a month.

But at the Grand Opening of the Kim Vo Salon in Las Vegas on Friday, she proudly displayed the diamond-encrusted ring with the initials BM.

Benji, 28, is the twin brother of Nicole Richie's fiancé Joel.