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Ellen DeGeneres may have scared Emily Blunt out of staying in the U.S.

The host played a prank on her guest during Monday's show after discussing the 32-year-old Sicario star's recent naturalization. "You have to learn a whole lot of things to become a citizen," DeGeneres said. Blunt agreed and playfully boasted, "I know more about the constitution and government than most American citizens."

DeGeneres' wife, Portia De Rossi, became a U.S. citizen in 2011. When the Arrested Development star was studying for her test, the host said she recalled thinking, "I don't even know these questions...things that we don't have to learn at all."

"Do you know patriotic songs and things like that?" DeGeneres asked Blunt.

"I feel like this going to get me in trouble," the actress said.

DeGeneres said the British actress should learn patriotic songs, "because there are a lot of songs that are sung at different events." To make it fun for all, she asked Blunt to "run back and put something patriotic on." She promised to wear something patriotic, top. "We're going to sing some patriotic songs," she said.

Blunt asked, "Will you sing them with me?"

"I'll sing them with you, sure," DeGeneres said.

Emily Blunt, The Ellen DeGeneres Show

Michael Rozman/Warner Bros.

After going backstage, Blunt reemerged dressed as Lady Liberty.

DeGeneres, meanwhile, held a United States flag.

"This is your outfit?" Blunt asked.

DeGeneres told Blunt that her first song would be "Yankee Doodle Dandy." What the actress didn't anticipate, though, was that a man dressed as Uncle Sam would pop up and scare her. "Oh, my God! Ah!" Blunt exclaimed. "I think I just peed myself."

When Blunt was on Jimmy Kimmel Live! last week, she discussed becoming a U.S. citizen. "People ask me about the whole day," she said. "They were like, 'Oh, it must have been so emotional.' I was like, 'It wasn't! It was sad!' I like being British. It was the most bizarre day. Matthew McConaughey's wife [Camila Alves] was getting sworn in with me, who is so nice. McConaughey shows up looking like he's going on safari. I was like, 'You could have worn a shirt and tie. Like, Camila looks amazing!'"

Blunt emphasized how hard the citizenship test was, saying, "I guarantee most Americans would have no idea how to answer any of these questions."