While Miley Cyrus was performing at the 02 arena in London in 2009, she changed the lyric in her song, "Party in the U.S.A.", from "And a Britney song was on" to...what?

Explanation

The American actress and singer Miley Cyrus was born in 1992. She is the daughter of country singer Billy Ray Cyrus. Cyrus rose to prominence in 2006 as a teen idol after being cast in the Disney Channel television series Hannah Montana. In 2007, she released her debut studio album in connection with the television series. Cyrus has later developed an adult image and mainstream pop sound and is among the most successful artists to originate from Disney.