On 3-4-12 at Planet Hollywood's Gallery Nightclub in Las Vegas, I got the chance to meet both James and Oliver Phelps (the Weasley twins from Harry Potter). After waiting for about an hour, an Australian guy asked us to join him in his VIP area which was basically in front of the twin' booth. My friend and I sat in front of the twins for 30 minutes or so and we were able to get pictures with both.
We didn't get autographs and they didn't seem too interested in talking with us. However, when redoing the picture with Oliver and me, someone moved my hand from his back and placed it on his bum! I was totally mortified and tried telling him I did not do that on my own accord, but I don't know if he understood me.
As I was leaving, James caught me slapping the Australian guy's ass and he (James) gave me a look of "Did you really just do that" to which I returned with a "Yep, it's what I do" look. He smirked as he continued his conversation.