The Pussycat Dolls will perform When I Grow Up in the boxingring of Vitali Klitschko vs. Samuel Peter. The fight is set in Berlin, Germany, and will be aired live on the  German tv channel “RTL”. If you’re living in Austria, Switzerland, Holland, Luxembourg, Romania, Croatia or Turkey you might be able to view it too. Click here for a scedule when it will be on in your country (in Germany at 22:25). Source

Also, click here for tickets for the boxingmatch (German though)