CHRISTINA Aguilera has promised fans that her next album will be heartfelt. The 'Beautiful singer, who has just finished a stint as a mentor on NBC series The Voice, confirmed that her next record will not be released before the end of the year. Aguilera told RTL: Its going to be a very heartfelt, deep-rooted and introspective record for me. Were hoping for release in spring/summer next year. The 30-year-old singer-songwriter currently features on Maroon 5s new single 'Moves Like Jagger and filmed a guest appearance for the accompanying video last week. A brand new track titled 'La Casa, which was recorded by Aguilera entirely in Spanish, will feature in Will Ferrells new movie La Casa de Mi Padre later this year. OMG