Peter Faccinelli Cops a Feel

"I love night shoots. Everybody else is [tired] by like two, three in the morning, which is weird because I'm the old guy!" Facinelli tells PEOPLE at the Los Angeles premiere of Ghosts of Girlfriends Past on Monday night.

"I feel loved by so many fans, like I went to Disneyland the other day, and I took like 100 pictures just walking like 10 feet … you want to give back to them."

Next up, Facinelli will play another kind of doctor in Nurse Jackie, a Showtime dramady debuting in June. How did he prepare to play the "quirky" character, who inappropriately grabs costar Edie Falco?

"I did do a whole class on boob grabbing!" he says with a laugh. What did wife Jennie Garth think about that? He teases, "[I told her], 'You're my test subject!' "