Amanda Bynes at an event for 17 again - Ritorno al liceo (2009)

Adam Lambert, Matt Giraud, Lil Rounds, Kris Allen, Anoop Desai, Allison Iraheta, and Danny Gokey at an event for 17 again - Ritorno al liceo (2009)

Brittany Snow at an event for 17 again - Ritorno al liceo (2009)

Nick Jonas at an event for 17 again - Ritorno al liceo (2009)

Judd Apatow at an event for 17 again - Ritorno al liceo (2009)

Keke Palmer at an event for 17 again - Ritorno al liceo (2009)

Leslie Mann, Michelle Trachtenberg, and Zac Efron at an event for 17 again - Ritorno al liceo (2009)

Matthew Perry, Leslie Mann, Michelle Trachtenberg, and Zac Efron at an event for 17 again - Ritorno al liceo (2009)

Adam Shankman and Vanessa Hudgens at an event for 17 again - Ritorno al liceo (2009)

Kevin Jonas, Joe Jonas, and Nick Jonas at an event for 17 again - Ritorno al liceo (2009)

Matthew Perry at an event for 17 again - Ritorno al liceo (2009)

Michelle Trachtenberg at an event for 17 again - Ritorno al liceo (2009)

Vanessa Hudgens at an event for 17 again - Ritorno al liceo (2009)

Zac Efron at an event for 17 again - Ritorno al liceo (2009)

Zac Efron in 17 again - Ritorno al liceo (2009)

Michelle Trachtenberg in 17 again - Ritorno al liceo (2009)

Leslie Mann in 17 again - Ritorno al liceo (2009)

Matthew Perry in 17 again - Ritorno al liceo (2009)

Michelle Trachtenberg and Zac Efron in 17 again - Ritorno al liceo (2009)

Matthew Perry, Michelle Trachtenberg, and Sterling Knight in 17 again - Ritorno al liceo (2009)

Leslie Mann and Zac Efron in 17 again - Ritorno al liceo (2009)

Matthew Perry and Brian Doyle-Murray in 17 again - Ritorno al liceo (2009)

Thomas Lennon and Zac Efron in 17 again - Ritorno al liceo (2009)

Matthew Perry and Collette Wolfe in 17 again - Ritorno al liceo (2009)

Zac Efron and Sterling Knight in 17 again - Ritorno al liceo (2009)

Leslie Mann and Nicole Sullivan in 17 again - Ritorno al liceo (2009)

Michelle Trachtenberg, Zac Efron, and Hunter Parrish in 17 again - Ritorno al liceo (2009)

Leslie Mann and Michelle Trachtenberg in 17 again - Ritorno al liceo (2009)

Michelle Trachtenberg and Zac Efron at an event for 17 again - Ritorno al liceo (2009)

Matthew Perry and Zac Efron in 17 again - Ritorno al liceo (2009)