With his shaggy locks tied back for a workout, Efron leaves his Beverly Hills gym. Plus: Tori Spelling, Nicole Richie, Matthew McConaughey and more.

  • JUST DUET photo | John C. Reilly, Will Ferrell

Credit: Scott Gries/Getty

Published: Wednesday Jul 23, 2008 | 05:00 PM EDT

JUST DUET

Call them the karaoke kings! Step Brothers costars Will Ferrell and John C. Reilly show off their vocal prowess with the Dolly Parton-Kenny Rogers classic "Islands in the Stream" (with Ferrell handling Kenny duties) Tuesday on their visit to MTV's TRL studios in New York. Their comedy hits theaters July 25.