What are these two songs called? :oooo?

One is by a girl, and lyrics go:
I just came to say hello, i came to party and i just came to say hello
o o o

Lol

Second is by a guy and it goes:
la la la whatever la la la it doesnt matter la la la
were gonna party tonight tonight, were gonna dance on the edge of the
hollywood sign tonight tonight

THANKS ! ;)