03/11/2008 AT 09:45 AM EDT
After his new girl-about-town Paris Hilton rocked a glittery
B-is-for-Benji Madden pendant and "BM" ring over the weekend, Madden stepped out Monday with his own love-dedicated bling: a "PH" ring on his ring finger. The couple that shines together also parties together, with Hilton, 27, throwing her beau a birthday celebration (Madden turned 29 Tuesday) at club LAX in Las Vegas on Sunday.
– Janet Mock