The boys rocked up to The Arts Club in Mayfair, and if these pics are anything to go by, soon found themselves surrounded by the ladies.
It's not exactly a secret that Niall Horan thinks Alexandra Burke is fit, so he must have been having a whale of a time. Good on ya Nialler.
Bit awkward for Chloe Green though.
Click next for more pictures of the boys at the party!
Niall, maybe it's time to lay off the sherries - that's not the right Louis.
Lovely as they are, we doubt Nick Grimshaw and Nick Knowles were the nicks Harry wanted to get in the middle of at the party.
They all look DASHING though.
Ugh, don't you hate getting papped mid-blink? NIGHTMARE.
(Note we said nothing about the macho hand gesture that's clearly just about to happen. Alright Tommo?)
Catching the attention of another older lady, ey Harry? Well, if you've got it...
The life and soul.
ONLY JOKING Louis, of course you are, we know you're just taking a moment to have a sip on your glass of vodka before you bust out the caterpillar move on the dancefloor.
Ah Liam, so many reasons to be smug; he looks gorgeous in his suit, he's just won a BRIT, and he'll be feeling peachy keen right about now while the other boys are probably vomiting into their hands and shouting for pizza and curry sauce in between their tears.
But they all looked rather handsome last night didn't they? Well done on the BRIT boyos!