Possible Clues:

• Same agents, but different actors adopt them
• "Elton John" and "Lady Gaga," e.g
• Old coach gets 24 across to start signing players - the ones who don't live off the family's notoriety!
• Elton John and Lady Gaga, for two
• John Wayne and Lady Gaga
• Lady Gaga and Katy Perry, e.g
• Lady Gaga and Jay-Z
• "Wells Fargo" and "Deadwood," say — travelling players used them
• Ethel Merman and Jack Benny, e.g.