Because I'm in a meaningful relationship, I'd have to decline her offer unless it was just going out on a platonic basis as friends...
We'd probably go out for some food first. I really like Japanese food so I would suggest that.
Sushi doesn't go down well with everyone, but luckily I have photographic evidence that suggests Selena is a fan of the raw fish:
After dinner we could go to a Lakers game, she seems to like doing stuff like that which is great because I'm a big sports fan (we have so much in common!)
I dunno who the guy in the photo above is, but I'd be having a much better time than him. He looks a little bored to be honest!
I would have to rely on Selena to get courtside seats for us though, I don't have those kind of connections.
After that we'd probably go somewhere quiet to chat and hangout a bit more, before she offers me a lift home in her private helicopter or however it is she gets around.