article_snippet.sent: Academy of Country Music Awards, 8 p.m. ET Sunday, CBS .
article_snippet.sent: Luke Bryan and Blake Shelton return to host the 50th annual awards.
article_snippet.sent: Christina Aguilera is set to perform a "surprise duet" (yes, that Christina Aguilera).
highlights_snippet.sent: Academy of Country Music Awards holds Academy of Country Music Awards 50th ceremony Sunday on CBS .