Ch-ch-check out Obama's AH-Mazing final WHCD speech (above)!
And this is why Rihanna rocks our socks so HARD!
But only managed to rack up an $80 bill.
When the waiter came by to pick up the tab, Riri apparently asked him about the biggest tip he's ever recieved, to which he replied "$100."
"Now I'm your biggest tip."
Man, the Diamonds songstress may not give a f*ck, but girl obviously cares a teensy bit about her fellow humanz to engage in such a generous act!
Even if $200 to someone like Rihanna is ass-wipin' money!