 | Michelle Pfeiffer | .... | Ingrid |
| Zac Efron | .... | Paul |
| Charlotte Marshall-Fricker | .... | Caring Teenage Girl |
| Fiona Choi | .... | Balinese Woman |
| Mary Marguerite Keane | .... | Pet Adoption Clerk |
| Michael Mandell | .... | Murray |
| Patrick Reale | .... | Times Square Cop |
| Robert De Niro | .... | Stan Harris |
| Halle Berry | .... | Nurse Aimee |
| Cary Elwes | .... | Stan's Doctor |
| Alyssa Milano | .... | Nurse Mindy |
| Common | .... | Soldier |
| Barbara Marshall | .... | Head Nurse Helen |
| Jessica Biel | .... | Tess Byrne |
| Seth Meyers | .... | Griffin Byrne |
| Sarah Paulson | .... | Grace Schwab |
| Til Schweiger | .... | James Schwab |
| Carla Gugino | .... | Spiritual Dr. Morriset |
| Amber Bela Muse | .... | Nurse Risa |
| Peter Allen Vogt | .... | Male Nurse |
| Ross Ryman | .... | Pedicab Driver |
| Kal Parekh | .... | Male Obstetrician |
| Katherine Heigl | .... | Laura |
| Jon Bon Jovi | .... | Jensen |
| Sofía Vergara | .... | Ava |
| Russell Peters | .... | Chef Sunil |
| Serena Poon | .... | Chef Ming |
| Sarge | .... | Monty |
| Ashton Kutcher | .... | Randy |
| Lea Michele | .... | Elise |
| Jim Belushi | .... | Building Super |
| Lillian Lifflander | .... | Mrs. Lifflander |
| Sarah Jessica Parker | .... | Kim |
| Abigail Breslin | .... | Hailey |
| Jake T. Austin | .... | Seth |
| Mara Davi | .... | Mika |
| Jaclyn Miller | .... | Choreographer |
| Cassidy Reiff | .... | Piper |
| Nat Wolff | .... | Walter |
| Kendra Jain | .... | Kelly |
| Julia Randall | .... | Julia |
| Christian Fortune | .... | Cody |
| Tatyana Disla | .... | Tatyana |
| Chealy Phoung | .... | Chealy |
| Marvin Braverman | .... | Vendor Marvin |
| Alexandra Guthy | .... | Screaming Rocker Girl |
| Denise Violante | .... | Female Cop Denise |
| Katherine McNamara | .... | Lily Bowman |
| Norman Bukofzer | .... | Newark Commuter |
| Beth Kennedy | .... | Piper's Mom |
| Josh Duhamel | .... | Sam |
| Joey McIntyre | .... | Groom Rory |
| Jackie Seiden | .... | Bride Trish |
| Sean O'Bryan | .... | Pastor Edwin |
| Larry Miller | .... | Harley |
| Jack McGee | .... | Grandpa Jed |
| Yeardley Smith | .... | Maude |
| Benjamin McGowan | .... | Logan |
| Jon-Christian Costable | .... | Duncan |
| Juliette Allen-Angelo | .... | Sadie |
| Penny Marshall | .... | Herself |
| Drena De Niro | .... | Ahern Waitress |
| Vanessa I. Mendoza | .... | Leopard Print Girl |
| Christine Lakin | .... | Waitress Alyssa |
| Sandra Taylor | .... | Patty |
| Shea Curry | .... | Wendy |
| Earl Rose | .... | Pianist |
| Johnny DeBrito | .... | Male Party Guest |
| Samuel E. Mitchell | .... | Penny's Dance Partner |
| Amar'e Stoudemire | .... | Party Dancer |
| Cherry Jones | .... | Mrs. Rose Ahern |
| Hilary Swank | .... | Claire Morgan |
| Chris 'Ludacris' Bridges | .... | Brendan |
| Kathleen Marshall | .... | Stage Manager Charlotte |
| Joey Sorge | .... | Radio Reporter Arthur |
| Rob Nagle | .... | Officer Nolan |
| Matt Walker | .... | Engineer Douglas |
| Wedil David | .... | Reporter Christina |
| David Valcin | .... | Reporter Murphy |
| Stephanie Fabian | .... | Reporter Lupe |
| Patrick Collins | .... | Reporter Fadda |
| Pat Battle | .... | Reporter Pat Battle |
| Tom Hines | .... | Brady Finley |
| Greg Wilson | .... | Wade the Aide |
| Hector Elizondo | .... | Kominsky |
| Anna Aimee White | .... | Ginger Adams |
| Sam Marshall | .... | Crowd Surfing Kid |
| Susan Silver | .... | Bunny Friedberg |
| Emily Moss Wilson | .... | Crazy Jensen Fan |
| Bob Weston | .... | Jensen Concert Police |
| Lucy Woodward | .... | Backup Singer |
| Stephanie Alexander | .... | Backup Singer |
| Nicole Michele Sobchack | .... | Kissing Reveler #1 |
| Anna Kulinova | .... | Kissing Reveler #2 |
| Rylie J. Neale | .... | Kissing Female Cop |
| Lily Marshall-Fricker | .... | Reveler Lucy Camille |
| Lori Marshall | .... | Reveler Ms. Camille |
| Ryan Seacrest | .... | Himself |
| Jessica Guadix | .... | Time Square Rep |
| Alex Kruz | .... | Music Executive (Party Guest) |
| Leroy S. Mobley | .... | Christian |
| Michael Shapiro | .... | Organist |
| McKenzie Shea | .... | Jensen Fan |
| Matthew Walker | .... | Engineer Douglas |
| Michael Bloomberg | .... | Himself (uncredited) |
| Matthew Broderick | .... | Mr. Buellerton (uncredited) |
| Daniel R Cooper | .... | Elevator Party Tenant (uncredited) |
| Meredith Croft | .... | New Year's Reveler (uncredited) |
| Marc I. Daniels | .... | NYC Commuter (uncredited) |
| Angel Dillemuth | .... | Flyer Distributer (uncredited) |
| Rosemary Howard | .... | Pedicab Pedestrian (uncredited) |
| John Lithgow | .... | Ingrid's boss (uncredited) |
| John A. Locke | .... | Masked Ball Attendee (uncredited) |
| John Mancini | .... | Bicycle Messenger (uncredited) |
| Josh McBride | .... | Stage Hands (uncredited) |
| Mike J. McNulty | .... | Times Square Reveler (uncredited) |
| Olan Montgomery | .... | Cowboy (uncredited) |
| Steven James Price | .... | Masquerade Ball Dancer (uncredited) |
| Katy Russell | .... | Times Square Enthusiast (uncredited) |
| Ryss | .... | NYC Commuter (uncredited) |
| Aspen Steib | .... | Kissing Girl (uncredited) |
| Mark Steiger | .... | Record Label Employee (uncredited) |
| Stacey Van Gorder | .... | Mrs. Troken (uncredited) |
| Barbara Vincent | .... | Times Square Partier (uncredited) |
| Odette Warder Henderson | .... | Partygoer (uncredited) |
| Paul Weaver | .... | Partygoer (uncredited) |
| Steven Weisz | .... | NYPD Sergeant (uncredited) |
Happy New Year
USA
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