![MEXICO CITY, MEXICO - October 17: Singer Demi Lovato poses for photos during a photo call to promote new hair product by Koleston 'Brightly Blondes' at Four Season Hotel on October 17, MEXICO CITY, MEXICO - October 17: Singer Demi Lovato poses for photos during a photo call to promote new hair product by Koleston 'Brightly Blondes' at Four Season Hotel on October 17,](https://c8.alamy.com/comp/2EWRW35/mexico-city-mexico-october-17-singer-demi-lovato-poses-for-photos-during-a-photo-call-to-promote-new-hair-product-by-koleston-brightly-blondes-at-four-season-hotel-on-october-17-2016-in-mexico-city-mexico-photo-by-eyepixsipa-usa-2EWRW35.jpg)
MEXICO CITY, MEXICO - October 17: Singer Demi Lovato poses for photos during a photo call to promote new hair product by Koleston 'Brightly Blondes' at Four Season Hotel on October 17,
![X Factor' judge Paulina Rubio reveals her new red hair color while becoming the ambassador for Koleston Where: Mexico City, K Stock Photo - Alamy X Factor' judge Paulina Rubio reveals her new red hair color while becoming the ambassador for Koleston Where: Mexico City, K Stock Photo - Alamy](https://c8.alamy.com/comp/E25T00/x-factor-judge-paulina-rubio-reveals-her-new-red-hair-color-while-E25T00.jpg)
X Factor' judge Paulina Rubio reveals her new red hair color while becoming the ambassador for Koleston Where: Mexico City, K Stock Photo - Alamy
![MEXICO CITY, MEXICO - October 17: Singer Demi Lovato poses for photos during a photo call to promote new hair product by Koleston 'Brightly Blondes' at Four Season Hotel on October 17, MEXICO CITY, MEXICO - October 17: Singer Demi Lovato poses for photos during a photo call to promote new hair product by Koleston 'Brightly Blondes' at Four Season Hotel on October 17,](https://c8.alamy.com/comp/2EWRW3D/mexico-city-mexico-october-17-singer-demi-lovato-poses-for-photos-during-a-photo-call-to-promote-new-hair-product-by-koleston-brightly-blondes-at-four-season-hotel-on-october-17-2016-in-mexico-city-mexico-photo-by-eyepixsipa-usa-2EWRW3D.jpg)