Possible Clues:

• One-named 'Tik Tok' singer
• One-named "TiK ToK" singer
• One-named singer whose name used to be spelled with a dollar sign
• Singer with the 2010 hit "We R Who We R"
• Musician who once changed the middle letter of her stage name to a dollar sign, but later changed it back to a boring old 'S'
• Singer with the #1 hit 'TiK ToK'
• "We R Who We R" singer
• Gaga contemporary
• "Blah Blah Blah" pop singer
• Word in many Bugs Bunny puns