If the wife wants to go, I'll take her but normally I hate these kinds of movies. Too many story lines and not enough time for everyone to get a "fair go" on screen.

Halle Berry was going to be Jon's original love interest in the movie but a custody battle for her daughter made her take on the smaller part in the movie and then the part went to Katherine Heighl and she is the reason why Jon took the part. She asked him. Here's part of an interview:

Interestingly, it was Berry's involvement (she plays a nurse) that made Bon Jovi agree to do this.

"Didn't I say I quit this? I did! (But) Halle Berry asked for me to be in it and who in their right mind would say 'no' to Halle Berry? My wife even hi-fived me on this. And I agreed to do it," he said. "It was as simple as that. Of course, Garry Marshall is a living legend. Because of Halle and Garry, I said: 'What the hell?'