In Honor of James Franco Joining the Cast of General Hospital: Five Other Superstar Soap Cameos

3. Lily Allen on Neighbours (2009)

British pop star stopped by Ramsay Street on the long-running Australian soap recently, of which she is a longtime fan. She played herself.

4. Jeremy Piven on Big Brother (2009)

It's not a daytime drama in the traditional sense, but there's something inherently soapy about the machiavellian power plays and whole-lotta-sitting-around-talking-about-nothing in every episode of Big Brother. That is, until Jeremy Piven shows up, to lecture the cast about his favorite causes -- his doomed summer comedy and toro poisoning.

5. Crystal Gayle on Another World (1987)

The singer with the ankle-length hair did a week-long guest stint on Another World, where she played a friend of Felicia Gallant followed by the serial-killing Sin Stalker.

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