Cameron Diaz and Ashton Kutcher in What Happens in Vegas (2008)

Cameron Diaz and Lake Bell in What Happens in Vegas (2008)

Ashton Kutcher, Zach Galifianakis, and Rob Corddry in What Happens in Vegas (2008)

Ashton Kutcher at an event for What Happens in Vegas (2008)

Dennis Farina at an event for What Happens in Vegas (2008)

Rob Corddry at an event for What Happens in Vegas (2008)

Treat Williams at an event for What Happens in Vegas (2008)

Vince Vaughn at an event for What Happens in Vegas (2008)

Bai Ling at an event for What Happens in Vegas (2008)

Brooke Burns at an event for What Happens in Vegas (2008)

Cameron Diaz at an event for What Happens in Vegas (2008)

Ashton Kutcher in What Happens in Vegas (2008)

Lake Bell in What Happens in Vegas (2008)

Cameron Diaz in What Happens in Vegas (2008)

Queen Latifah in What Happens in Vegas (2008)

Rob Corddry in What Happens in Vegas (2008)

Ashton Kutcher and Rob Corddry in What Happens in Vegas (2008)

Cameron Diaz, Ashton Kutcher, Tom Vaughan, and Tom Vaughn in What Happens in Vegas (2008)

Caroline with Ashton & Cameron on the set of "What Happens in Vegas."

Caroline on the set of "What Happens In Vegas" with Cameron Diaz.

Caroline on the set of "What Happens In Vegas" with Lake Bell.

Caroline on the set of "What Happens In Vegas" with Jason Sudeikis.