A signed 8x10 inch photo (glamour pose), autographed in-person by Christina Aguilera. In-Person Signature. Authentication: ACOA Certification Number: RA61678 Collector Note: As one of the most recognizable voices in contemporary pop, Christina Aguilera autographs consistently attract collector interest. Glamour pose photographs offer a refined and eye-catching aesthetic that stands out in any signed photo collection. In-person authenticated examples are particularly desirable for their firsthand acquisition appeal. An elegant and highly collectible piece of modern music memorabilia.