Possible Clues:

• Alan of 'Growing Pains'
• "The Masked Singer" judge Robin
• 'The Masked Singer' judge Robin
• Actor Alan whose last name is a homophone of a synonym of 'dense'
• "Blurred Lines" Robin
• "Lost Without U" Robin
• "Blurred Lines" singer Robin
• 'Blurred Lines' singer Robin
• 'Growing Pains' actor Alan
• 'Growing Pains' co-star Alan