Miley Cyrus kicked off her endless summer vacation, albeit a few months early, with a star-studded soiree to celebrate the release of her eighth studio album.The 30-year-old «Flowers» singer arrived Thursday night arm in arm with boyfriend Maxx Morando dressed to the nines as they sauntered into Gucci's Osteria da Massimo Bottura (that's Gucci House's fancy talk for contemporary Italian restaurant) in Beverly Hills. It was a rare public appearance for Cyrus and the Lilly rock band drummer, but it was very much warranted.Cyrus on Friday dropped, a 13-track album recorded in Los Angeles and produced with Mike WiLL Made-It, Greg Kurstin and GRAMMY Award-winning Album of the Year producers Kid Harpoon and Tyler Johnson.