Nicole Scherzinger sings.
Hush Hush; Hush Hush . Lead and background vocals for both versions of the song are performed solely by lead singer Nicole Scherzinger . Nicole Scherzinger . She rose to fame as the lead singer of the burlesque troupe-turned-recording act the Pussycat Dolls , who became one of the world 's best-selling girl groups . Throughout her career , she has had a total of three UK number one singles , two of which coming from recording group The Pussycat Dolls and one as a solo artist . She has sold over 60 million records worldwide , as a solo artist and as the lead singer of the Pussycat Dolls .