FROM OSCARS.ORG: Beverly Hills, CA (February 22, 2010)- Miley Cyrus, Zac Efron, Taylor Lautner and Kristen Stewart will present at the 82nd Academy Awards®, telecast producers Adam Shankman and Bill Mechanic announced today. This will be Cyrus and Efron’s second appearance, and Lautner and Stewart’s debut on an Academy Awards telecast.

Efron is currently working on “Charlie St. Cloud,” scheduled to be released later this year. His other film credits include “Hairspray,” “High School Musical 3: Senior Year,” “17 Again” and “Me and Orson Welles.”

Academy Awards for outstanding film achievements of 2009 will be presented on Sunday, March 7, 2010, at the Kodak Theatre at Hollywood & Highland Center®, and televised live by the ABC Television Network beginning at 5 p.m. PT/ 8 p.m. ET. The Oscar presentation also will be televised live in more than 200 countries worldwide.

Source: Oscars.org