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

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

Eva Longoria and Lake Bell at an event for What Happens in Vegas (2008)

Eva Longoria at an event for What Happens in Vegas (2008)

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

Lake Bell at an event for What Happens in Vegas (2008)

Cameron Diaz, Ashton Kutcher, Rob Corddry, and Lake Bell at an event for What Happens in Vegas (2008)

Cameron Diaz, Ashton Kutcher, and Lake Bell at an event for What Happens in Vegas (2008)

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

Michelle Krusiec 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)

Cameron Diaz and Ashton Kutcher 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.