What font is used for Bruno Mars? His name, the the 'Doo-Wops & Hooligans' part, I know that one.
For a second it sort of looked hand written, but I don't think it is now that I take a good look at it (I can't really see any differences between the Rs).

i changed the sample
On this bigger one, we can clearly see the two R are different. Handwritten, for sure.

Some fonts with a look very close in thise theme :
http://www.dafont.com/en/theme.php?cat=102&page=1&nb_ppp=50&text=BRUNO+MARS