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Singer Nick Lachey signs autographs for young fans at the 20th anniversary Time for Heroes Celebrity Carnival to benefit the Elizabeth Glaser Pediatric Aids Foundation, Sunday, June 7, 2009, in Los Angeles. (AP Photo/Gus Ruelas)

Actress/singer Miley Cyrus arrives at the 20th anniversary Time for Heroes Celebrity Carnival to benefit the Elizabeth Glaser Pediatric Aids Foundation, Sunday, June 7, 2009, in Los Angeles. (AP Photo/Gus Ruelas)

Laila Ali arrives at the 20th anniversary Time for Heroes Celebrity Carnival to benefit the Elizabeth Glaser Pediatric Aids Foundation, Sunday, June 7, 2009, in Los Angeles. (AP Photo/Gus Ruelas)

Actors Sharon Stone and Joe Pesci attend the 20th anniversary Time for Heroes Celebrity Carnival sponsored by Disney to benefit the Elizabeth Glaser Pediatric Aids Foundation, Sunday, June 7, 2009, in Los Angeles. (AP Photo/Gus Ruelas)

Model Heidi Klum arrives at the 20th anniversary Time for Heroes Celebrity Carnival to benefit the Elizabeth Glaser Pediatric Aids Foundation, Sunday, June 7, 2009, in Los Angeles. (AP Photo/Gus Ruelas)

Actress Cheryl Hines and daughter Catherine Rose Young, 5, arrive at the 20th anniversary Time for Heroes Celebrity Carnival to benefit the Elizabeth Glaser Pediatric Aids Foundation, Sunday, June 7, 2009, in Los Angeles. (AP Photo/Gus Ruelas)

Actress Selena Gomez attends the 20th anniversary Time for Heroes Celebrity Carnival to benefit the Elizabeth Glaser Pediatric Aids Foundation, Sunday, June 7, 2009, in Los Angeles. (AP Photo/Gus Ruelas)

Constance Marie with daughter Luna Marie, four months, arrive at the 20th anniversary Time for Heroes Celebrity Carnival to benefit the Elizabeth Glaser Pediatric Aids Foundation, Sunday, June 7, 2009, in Los Angeles. (AP Photo/Gus Ruelas)

Actor Mark Wahlberg arrives at the 20th anniversary Time for Heroes Celebrity Carnival to benefit the Elizabeth Glaser Pediatric Aids Foundation, Sunday, June 7, 2009, in Los Angeles. (AP Photo/Gus Ruelas)

Actress Denise Richards and daughter Lola Rose Sheen arrive at the 20th anniversary Time for Heroes Celebrity Carnival to benefit the Elizabeth Glaser Pediatric Aids Foundation, Sunday, June 7, 2009, in Los Angeles. (AP Photo/Gus Ruelas)

Actress/singer Miley Cyrus arrives at the 20th anniversary Time for Heroes Celebrity Carnival to benefit the Elizabeth Glaser Pediatric Aids Foundation, Sunday, June 7, 2009, in Los Angeles. (AP Photo/Gus Ruelas)