The singer took a stroll Thursday at a park in Burbank where she arrived with a friend both wearing attire totally NOT conducive for a park visit. White booties? Really?!

Selena and her friend -- BTW, also wearing booties -- looked like they knew what they were there for ... to appear like little kids at heart and be moved by a little girl reading a book while sitting on the swing.

Sweet, but staged, don't you think?