Katy Perry returned to the city she now calls home, Los Angeles, on August 5 for a three-night stint at the Nokia Theater, the latest stop on her California Dreams Tour. And while her crowd-pleasing set was packed with surprising covers (including Whitney Houston's "I Wanna Dance With Somebody" and a mashup of Rihanna's "Only Girl In The World"/Willow Smith's "Whip My Hair"/Jay-Z's "Big Pimpin'"), it was another cover, of Rebecca Black's "Friday" with fellow California gurl Rebecca herself joining in, that was the biggest surprise of all. And it just so happened to be a Friday night!
Katy seems determined to help Rebecca Black--or "the infamous Rebecca Black," as Katy introduced her to the Nokia crowd--extend her 15 minutes of fame. Rebecca recently made a cameo in Katy's "Last Friday Night" video (playing the BFF of Katy's geek-girl alter ego, Kathy Beth Terry), and when the two reunited onstage this week, Katy beamed at her like a proud mother figure. Their surprise duet ended with




