By Chiara Fiorillo Iconic singer Dolly Parton is today celebrating her 78th birthday and made a surprise announcement to mark the day. The star announced on social media that she is releasing four never-released songs to go with the Rockstar album as well as “a few others that you may have heard before that were not on the album.” Writing on Instagram, she added: “I hope you enjoy them, and I hope you all have a happy birthday for me! LOL. Thanks for everything, Dolly.” Back in 2020, Dolly also released an autobiography, “Songteller: My Life in Lyrics”, giving fans a rare peek at her real hair…