Christina Serenades Billionaire

Some say Christina Aguilera’s rare mix of old-school talent and new-school sensuality makes her appealing to fans ages 8 to 80. Last weekend, the Grammy-winning chart-topper put that theory to the test.

Aguilera was one of several high-profile celebrities who surprised more than 500 guests with an appearance at the 84th birthday celebration for millionaire lumber magnate Joe Hardy in southwestern Pennsylvania. Joining Robin Williams, Bette Midler and the Broadway cast of “A Chorus Line,” Aguilera finished off the 12-hour party in style with a performance of “Beautiful” and what could be her next single — the new classic “Happy Birthday, Mr. Hardy.”