Are miley cyruss songs sung by Emily osment?

No, Miley Cyrus and Emily Osment are two separate artists. They both starred in the Disney Channel series "Hannah Montana", where Miley played the main character Miley Stewart, who also had a secret identity as pop star Hannah Montana. Emily played Lilly Truscott, Miley's best friend.

While Emily has her own music career, she did not sing the songs for Hannah Montana. All the songs performed by Hannah Montana were sung by Miley Cyrus.