Butt WTF Is That!?

OK guys, two questions just for fun! –
1) Whose butt does that belong to? (we’ll reveal that over the weekend)
2) We found some unidentified object/substance/thing there where it’s circled but can’t fathom what it is. Can anyone help? What is that!!?? (we do not know the answer to this one really, so please let us know what you think!)
We have a spare Gmail invitation in our drawer, so we figured this is a good time to give that away. So! The first person with the correct answer to Question 1 (we dunno if there’s ever gonna be a correct answer to the second one) will get the Gmail invitation! But please feel free to participate even if you don’t fancy our humble ‘lil pressie. =)
Thanks and have fun!