EW Staff
May 06, 2011 AT 04:00 AM EDT

Britney Spears is reportedly penning three new tracks for Selena Gomez, and Lady Gaga just wrote ”Hypnotico” for J. Lo. Take our quiz to find other surprise pop-star scribes.

Who wrote it?

1. Katy Perry

2. Ke$ha

3. Pink

4. Alicia Keys

Who sang it?

A. Adam Lambert
”Whataya Want From Me”

B. Kelly Clarkson
”I Do Not Hook Up”

C. Whitney Houston
”Million Dollar Bill”

D. Britney Spears
”Till the World Ends”

Answers: 1-B; 2-D; 3-A; 4-C

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