Ellen DeGeneres always has a surprise in mind for her guests.

Emily Blunt visits “The Ellen DeGeneres Show” on Monday ahead of the release of Disney’s “Mary Poppins Returns”.

RELATED: Emily Blunt Rocks Vogue Cover As Mary Poppins

The actress, 35, reveals she has a fear of singing in front of live audiences. DeGeneres offers her a helping hand by bringing in some live performance pros: The Backstreet Boys.

Blunt and the Boys sing “I Want It That Way” before the boy band take the reigns on “Don’t Go Breaking My Heart” from their upcoming album DNA.

RELATED: Kanye West Belts Out Backstreet Boys With Mark Zuckerberg

The Backstreet Boys also spill the beans in a game of “Never Have I Ever”. Find out who has hooked up with a groupie, who has forgotten lyrics on stage, and who has joined the mile high club.

“Mary Poppins Returns” to theatres on Dec. 19.